oh man I'm so hyped about this series now!!! I hope they keep this up for a while, especially considering it's what I want to do in college and whatnot. I love that they keep the terms simple enough for anyone to understand, too, as in I'm sure most of their videos, and words that not everyone would know they define and explain. I love this channel, I know there's probably a lot of these comments but I had to share my thoughts as well.
you sir, have earned your like. thank you, for your passion, and your ability to capture my attention. i have learned something from this lesson. i look forward to my next.
I love these videos! Please keep them coming. One small error I noticed about the seasons discussion. The day is not longer or shorter because of the length of the path the Sun takes through the sky. The length of day depends on the FRACTION of the path that is above the horizon. Polaris has a very tiny path length on the sky as it does its tiny circle around the north celestial pole but since 100% of that path is above the horizon it never sets. The length of the Sun's path on the winter solstice is the same as on the summer solstice but a larger or smaller fraction of the path will be above the horizon depending on which hemisphere you are in. I suppose this is all packed into your phrase "path in the sky."
RapiBurrito I don’t understand why you feel the need to be a jerk. No one cares if you don’t believe in astrology and you shouldn’t care if people believe something that you don’t. We learned to respect others in kindergarten
not that i want to in any way start this argument, but astrology does take into account precession. Birth year, day, and time take into account where the sun, moon, and all the planets are located, so it's not based on positions from ancient times. Ok that's all :)
well that's besides the point. im making nary an argument for either side. just pointing out a factor that is accounted for where in this video was questioned :) tis all.
of course astrology takes it into account. in fact, that´s an argument that goes back thousands of years, between so called tropical and sidereal astrology. but never-mind that, let´s dismiss precious human knowledge as silly.
If seasons are due to tilt, then how does this explain the ice age? How could the Earth do such a feat? I mean, it's like magic. Also, how the Earth know when to tilt back? What force is responsible?
I always appreciate scientist that do not feel so superior to the ancients and understand that even with our great technological gains we have lost many things too.
I'm not disagreeing with you but just wondering, what have we lost? Besides the night sky(because astronomers build their observatories away from cities and the problem is easily overcome)
Garret Griffith I would call it... the feeling. Those people had no advanced math, no astronomical apps on their phones e.t.c and still they knew and saw a lot. They did this not only with another instruments but with another parts of the brain.
dalex641 Maybe it's just because I perceive this sort of thing differently, but that explanation seems similar to me saying that I lose something by wearing glasses. Even without a full range of focal distances, I could still see and understand a lot, but with my glasses on, I see so much more and can make much better judgements about what is going on around me.
Garret Griffith imo we've lost a daily, intimate relationship with our planet. yeah we know it's great. but it's like the difference between visiting a really awesome grandparent and living with one. now we visit, but the ancients lived everyday getting to hear all the little stories that wouldn't make the holiday highlight reel. they had to devote more time to her, so they got more connected. I think we are now missing that connection. .....ok, maybe that's not the best analogy but that's all I got. :)
sebrussell Exactly! My parents always used to say the same thing. Why do you always wear your glasses when when your reading they would say. Im near sited so I can only see about 6 feet in front of me. I always said that I see the same reading with or without glasses but the glasses help me see everything about the world at will. I feel that while I completely respect others opinions, I feel that I value greater understanding just a LITTLE bit more. I understand where you guys are coming from though.
Moon... What your saying is true... I think that would be a dream of every astronomer.. Won't it? As per the development in industrialization, more and more lights(like vapor lights) is fading the beautiful lights of the night sky... When I was little, I use to watch the night sky all the time(of course at night), is spend hours and hours just watching and thinking... What's there imaging what could be there... At last my mom have to take me to my room as I end up sleeping... 😅 But what's the point is that I don't like it doing now, cause even if I try. I can't see the sky clearly... And that frustrates me up... and I'm not talking about ten or fifteen years... I'm talking about just five years ago...!!! I think I wrote it to long... 😅
It's really refreshing to hear someone say that a thing like astrology is silly, without being afraid to offend someone. Because, come one. Astrology is nuts.
I'll be covering a lot of topics in this series, including some astrophysics (like how light gets emitted in gas clouds; how stars form, evolve, and die; stuff like that). I hope you like it!
In the first episode you said you would talk about subatomic particles. What exactly did you mean by that? What will you be going over? Will you get into theoretical physics and astrophysical topics? Also, how many episodes of this do you think there will be? This is probably my favorite CrashCourse so far by the way! :)
Astronomy might be scary but it's interesting to study about the other worlds. Did you all know that Jupiter is the reason why planet earth isn't a pit of asteroids? It's because the gravitational force of Jupiter is so great that anything that comes within its boundaries will eventually get sucked in and ultimately spat back into the farther regions of the solar system? Neat huh?
I want to be an astrophysicist and was woundering (in astronomy) what order I have learn the math for it. Is it factual information first and then math or vice versa?
@@ghania5869 yes sir I did 😁 also did you know its made completely out of gas? And that it's the fastest spinning planet in the solar system? And that the clouds are 50km thick? And that it has rings and is made almost completely out of gas and that the center is hotter than the surface of the sun? 😂
BosonCollider To put it in perspective, Sydney is roughly the same distance from the equator as Los Angeles. We do get consistent winter snow in the mountains of the Great Dividing Range and occasionally Tasmania and extremely rarely elsewhere like in Western Australia.
BosonCollider Snow in the major cities is a once-in-a-century kind of event. Snow in the alpine region is regular, but only for a few months each year.
seriously. I have a friend who makes it a point to mention astrology whenever I do anything. "Well that's because you're a Gemini", or "of course you think like that, you're a Gemini". what should I tell her to get her to shut up and potentially get her to see things more logically?
+Elmer G Ask her to predict your decisions based on your supposed astrological traits. If it's so obvious that a Gemini would do that, then she should have no trouble predicting your decisions.
You can show her this videos, and let the truth reveal itself. No need to shut her up, give her the choice to see all points of view, if she is smart and humble, then she will change her "silly" ways. Be humble yourself also, no truth gives right to shut no one up.
There is a free program called stellarium. You can adjust the date and time to show how the constellations "entered" the sun 2000 years ago, when they were first named. And then compare it to now and see that our drift has put the astrological signs off by one month.
It always amazes me how life is situated. The way stars and planets dance. How can someone not want to understand why and how it is that we exist. In a world where people think they know it all, we come to see how much we actually don't know at all. Peace and love fellow humans.
HeinzP100 We do have people looking these things over, but every now and then stuff falls through. To err is human and all that. Speaking of, I'm betting those 10 points really go to Ravenclaw. What say you, BosonCollider? -Nicole
CrashCourse Ravenclaw is good. ; ) I thank my hours of playing kerbal space program with mods. When you've seen Earth rotate from space many times you notice things like this very quickly. Otherwise I would've known it intellectually but I wouldn't have noticed it on the spot.
This series is completely amazing, it has inspired me to learn more about astronomy and potentially even pursue it in the future, so greatful for these videos
I have lived my ENTIRE LIFE in the Inland Empire area of Southern California, due to smog I can only see the brightest objects in the sky in the remotest locations. Even then there dim and not numerous, we only have the moon. I was 24 (im soon to be 29) years old before I saw the vaguest hint of the Milky Way while visiting Spokane Washington. I was 27 before I saw the night sky in all its glory, and I wept.
It may be, I didn't finish the video this guy gets on my nerves, I dunno what it is. Unfortunately cosmology is one of my favorite subjects, I was really looking forward to this series.
I think that everytime you start on a subject. It is essential that you start at the very basic and move up to more complicated topics just to cover all the bases. The same logic applies in school with people's programs. Every first week or so of school is the basic, or recap from last courses. Then move on to the new stuff.
Arraik Cruor I agree, and I'll be back once he gets to things less common than "Planets move in the sky". The other CC series are for high schoolers, and this seems designed for elementary and middle schoolers, but that may be perfect. I never would have gotten into math or science without first being _psyched_ about the existence of planets and galaxies. He may also be speaking more slowly than John or Hank, but of course a lot of people hate that about the Green Brothers.
Hi, love your crash course astronomy videos. Just a note of clarity on this one, the astrological system that's widely used today is the tropical zodiac, which is based upon the seasons thus always begins with 0° of 'tropical' Aries on the date of the northern hemisphere's spring/vernal equinox. Tropical zodiac signs are different to the constellations but share the same names - hence the confusion. There is also the less common sidereal zodiac, which is still based upon the fixed stars of the constellations and does apply precession.
Holy cats you could hear that? I had to re-record a bit of audio to be inserted right there. If I were watching the video I don't think I would've noticed! Good ears. :)
***** Yeah, it definitely stuck out to me as well... Much lower bitrate than the rest of the audio. I also found the post-production 'zooms' to be annoying (cropping to simulate a zoom, resulting in noticeably lower resolution). The content is fantastic though!
Love all your teaching! One request: Don't edit out your natural breathing (rest) points. A natural rest point is a great spot to digest the wealth of information you share. Hope you make much more of these great videos!
Really enjoying this so far, looking forward to future episodes. For me personally, it's much easier to learn & comprehend when there are visuals to go along with the lecture. I would love to see more animation while Phil is explaining things - maybe even just a window on the right of the screen next to him with a small visual representation of what he is describing. At any rate, very enjoyable and I've been a fan of Bad Astronomy blog for a long time nice to see you in Crash Course Phil!
To everyone here who is saying this stuff is way to easy, and all common knowledge: Firstly, this is an intro series. Its great that someone is making a difficult topic easily accessible to people who know nothing about Astronomy. Secondly, if you've watched other crash courses, such as Biology, you'll know that they also start pretty simple. The first episodes of biology crash course were what I learned at 13/14 years old. But the information gets more complex as you continue. Lastly, if it's really that boring, watch someone else. Let the rest of us enjoy.
Thats why i have to wait untill october to see Mars fully. I live on Iceland and at night during sumer the night is bright and you cant see any stars or planets.
I like that they are bringing new people onto the show. Hank and John are cool, but it's cool to see new faces. Plus those two can only do so much, now we get even more variety!
@@rittenbrake1613 I keep seeing people like you on comment sections, copy-pasting the same things. If you need help getting a life, you can find one at your local supermarket, right next to the clues.
@@TheWolfboy180 hello do u dare to talk to me in person? I m thinking u r one of those ignorant people keep banning the new birth of an idea like those people suppressing science development at the early stage.
@@TheWolfboy180 I m sorry your ignorance completely pissed me off ,u r insulting all the people who are studying the rule of this dimension ,my comment is a very academic one , I m genuinely analysing the situation, if your IQ is too low to understand please shut up and go to YOUR local supermarket.
@@rittenbrake1613 I would dare talk to you in person. You comparing astrology to the early development of science is nonsense. Science was born of a desire to understand the world. It, by definition, has to be flexible, because theories change as new evidence is introduced. But it does not bend to claims with no evidence. If you truly believe astrology is a science, I suggest you do your research. Find out more about studies on astrology. Just because science was once an underdog doesn't mean the current underdog status of pseudoscience isn't warranted. "New" ideas in science are worth nothing if their pretense is built upon tradition and bold claims without explanation and nothing else. Your comment is not an academic one. If you'd like to see a genuine analysis of the situation, start with these sources: Thagard, Paul R. (1978). "Why Astrology is a Pseudoscience". Proceedings of the Biennial Meeting of the Philosophy of Science Association. 1: 223-234. doi:10.1086/psaprocbienmeetp.1978.1.192639. Astrology. Encyclopædia Britannica. Sven Ove Hansson; Edward N. Zalta. "Science and Pseudo-Science". Stanford Encyclopedia of Philosophy. Retrieved 6 July 2012. "Astronomical Pseudo-Science: A Skeptic's Resource List". Astronomical Society of the Pacific. Hartmann, P.; Reuter, M.; Nyborga, H. (May 2006). "The relationship between date of birth and individual differences in personality and general intelligence: A large-scale study". Personality and Individual Differences. 40 (7): 1349-1362. doi:10.1016/j.paid.2005.11.017. Try to find ways to speak that don't mislead gullible people like yourself.
Thank you for calling astrology silly :3 Also, the fact that we are closer to the sun in January makes the misconception about seasons even more funny to me. So thanks for that as well!
Allah said, الشَّمْسُ وَالْقَمَرُ بِحُسْبَانٍ ﴿٥﴾ The sun and the moon (run) on fixed courses. They move in their orbit in perfect succession, according to precise calculation that is never delayed nor disturbed, لاَ الشَّمْسُ يَنبَغِى لَهَآ أَن تدْرِكَ القَمَرَ وَلاَ الَّيْلُ سَابِقُ النَّهَارِ وَكُلٌّ فِى فَلَكٍ يَسْبَحُونَ It is not for the sun to overtake the moon, nor does the night outstrip the day. They all float, each in an orbit. (36:40), فَالِقُ الإِصْبَاحِ وَجَعَلَ الَّيْلَ سَكَناً وَالشَّمْسَ وَالْقَمَرَ حُسْبَاناً ذَلِكَ تَقْدِيرُ الْعَزِيزِ الْعَلِيمِ (He is the) Cleaver of the daybreak. He has appointed the night for resting, and the sun and the moon for calculating. Such is the measuring of the Almighty, the All-Knowing. (6:96), Thank god of the bless of being muslimah
some body dude, I’m not taking the word of a couple religious pilgrims over 1 million separate observations of the greatest scientists there are. If you find some kind of proof, go collect your Nobel prize
Yeah, that's always a risk. :) Oddly, the temperatures there aren't that much affected by it, since the southern hemisphere is mostly water. I wanted to include that in this episode, but there just wasn't time!
1. I'm really enjoying these videos. I find astronomy fascinating, and you explain it in a wonderfully engaging way. 2. If you (or anyone else) have any interest in it, you might want to look into astrology a bit more. Astrology goes way beyond silly horoscopes in newspapers (which really are ridiculous). It's much more complicated and thoughtful than you might assume. It's actually very interesting.
I'm really enjoying this series! Phil is a great teacher, and I feel like i can listen to him talk about this stuff all day, and not get bored! Thanks Crash Course!
Excellent series. However, I was hoping for a guide to how to locate things in the night sky: What are the brightest stars; how to identify the constellations; "arc to Arcturus" and such. The series seems to assume people already know all of that. I'll have to look elsewhere for a "guide to the night sky." I have a telescope that you calibrate by pointing it at three stars. I'm trying to learn my way around the sky enough to find them. (Plus I'm in the city where there aren't many to choose from...)
"Those folks long ago were tied to the sky; They knew it like you know the streets in your neighborhood" Except when some tried to understand it deeper, those exact folks prosecuted them for heresy.
I feel like the wrong stuff is highlighted as text in the videos. I would much rather the actual facts or concepts to be written that way so I could make better notes. The other stuffs easy to understand so I don’t really get the point. LOVING this crash course though!! All this knowledge for free?? My month has been made
OK the major factor in seasons and temperatures is the tilt of the Earth toward or away from the sun. But there is still this not negligible variation in distance to the sun from 148 millions to 153 millions kilometers. Does this have a secondary, but noticeable effect? For instance, in December, for the southern hemisphere, the effects add up: the planet is tilting towards the sun at the same time it is closer to it. Does this mean that, all other things being equal (and I know they are not really), summers in the southern hemisphere are warmer than in the northern one?
Hands down CrashCourse is the best channel on RU-vid. I wish we had this when I was in school. I was gonna say that unlike CrashCourse History CrashCourse Astronomy's comment section won't be a flame war of who's right and wrong but then I remembered this is the internet. And the Internet should never be underestimated in it's ability to create debate
So the Earth is closest to the sun when the Northern Hemisphere in experiencing winter and the Southern Hemisphere is experiencing summer. Does it mean that summers in the Southern Hemisphere will always be hotter than summers in the Northern Hemisphere? Or distance doesn't change at all the amount of solar energy that reaches the surface?
I don't dislike this series, but I feel it is aimed at a lower level than the other crash courses. Like this is for early high school students instead of college students. As someone who has watched all of the other videos in the series this seems like a bit of a let down for such a cool topic.
Agree, it felt a little like primary school for a moment. But when he explained the summer and the winter, what I didn't know about that, is that summer was farther away than winter from the sun. So... I might have needed the basics refresh! Haha
I think it is more of an intro to astronomy. You can't just jump right into a topic like astronomy and expect everyone to understand what you're talking about. In fact, you can't do this with any science. If you look at Crash Course history though, you can't introduce someone to history because unless you went to a highly censored school or you never went to school, you know the basics already. What you know is not what everyone knows. If you like Astronomy, obviously you know this already but someone who has never learned anything about it ( and in school they barely cover astronomy) would need those basic informations to get into the topic.
I love how the video riles up astrologers with the precession comment. And yeah, it doesn't take precession into account. Nor the actual position of the sun at birth. I would be an Aries instead of a Taurus if it was so. Keep up the good work! Nice crash course. I also wish I could see more stars at night. #nomorelightpollution
3:33 what's cool about being greek is that I don't even consider this a fan fact, in fact this along with milllions of other words have a special meaning as well that only natives understand
Vedic astrology has fixed the axis shift by multiplying the calculations by a factor known as ayamsha. You might be a good astronomer but you sure don't know about astrology. Study the subject before commenting if something is silly or not because that what a scientist does PERIOD 🙏🇮🇳
for what I understand, it would actually be really strange if it wasn't. Due the conservation of angular momentum, any spherical gas cloud tends to collapse into a flat disk. This is why many galaxies are spiral and "flat". Also, due to the gravity interaction between planets, they tend to correct one another's orbits and keep them all roughly in the same place. The big moons of Jupiter for instance are locked in a synchronized dance where each moon circles Jupiter a multiple of times the previous moon does. Kepler even thought this "resonance" phenomenon between planets had some kind of spooky relationship to the Platonic solids, and in (unsuccessfully) trying to prove it he stumbled with Kepler's Laws for orbital motion!
There is a physical reason. I can't explain it very good, but the solar system was formed from loose mass floating about. Because of this mass rotation, it flattened out (like if you have a blob of stuff on a plate and rotate the plate, the stuff will try to get to the corners making the former blob more disk like). Don't ask me why this thing is rotating in the first place :D
Actually that's too improbable to be a coincidence, I heard some time ago that some people thinks that another star passed near from the sun and pulled out small parts from the sun that later cooled down and became the solar system. When I heard that thing for the first time, I thought that it souls too arbitrary to be true, but after seeing that all the solar system is in the same planet, that explanation has much more sense.
dkSilo it's actually not that difficult to understand. _All_ objects have a certain amount of "angular momentum", which keeps constant throughout the entire existence of the object as long as it doesn't gains or looses mass. So our solar system started as you say, from a loose mass of gas floating around. The gas began to collapse due to its gravity, like a balloon loosing its air, and as it did, its radius diminished rapidly, which according to the conservation of angular momentum, meant that its rotational speed, however tiny or minuscule it was in the beginning, also began to increase. This is exactly what happens with the famous example of an ice skater spinning with her arms extended and then retracting them towards her body, speeding up. The original gas cloud doesn't needs to have a significant rotation. Once it begins shrinking it will inevitably start spinning faster and faster :)
luis enrique vargas azcona I think that what you read was about a competing scientific theory for planet formation that was debated at the same time than the current (and so far confirmed) "nebular hypothesis" which states that the sun and planets all formed from a same spinning gas cloud. For many years it was unclear if the nebular hypothesis or the star-ripping one you say were the correct ones. But thanks to our observations of proto-stars and young solar systems we're already quite sure that another star "ripping" the planets off the sun is not how solar systems are made :) And what's really interesting is that there were (and still are), *many* more hypotheses trying to explain it: en.wikipedia.org/wiki/History_of_Solar_System_formation_and_evolution_hypotheses
Actually Vedic astrology takes precession into account. That's why it is accurate by someone who is well versed in it as opposed to Western astrology which doesn't take the wobble into account. Folks who don't do their homework and dismiss the rest of the world as well as the ancient sciences are the ones who are missing out...and that's what we Indian folk call karma!
No. Just do your homework instead of following the mainstream scientific consensus. I repeat: just do your homework. Astrology has been around for a lot longer than the new official religion of science over metaphysics and everything else. I could go on for so long but unless you gave the slightest sign of doing your homework, why bother. Mainstream is mainstream !
Touched a nerve there. I am not the one with extradinary claims. Science is not a religion, it is concerned with proving or disproving hypothesis. The burden of truth is on you, friend to prove what you are saying. I have seen no proof that you can make predictions or decisions based on any kind of astrology. I read a little about it and can see no basis to believe any of it.
+Esteban Steven .Goode Hill There is a reason why it is mainstream- it is the best explanation we could come up with. It agrees with all observations, plus allows us to make accurate predictions. Just because it has been around for a long time does not mean it is correct. I say this as a person who once believed such things, but now do not.
Well, the connections the writers make will probably fade as the episodes go on, but the ones made already and probably all future ones are going to be important for getting the information across properly. They, in their origin, are fairly intertwined, and there's nothing the writers can do about that.
Both involve looking at the stars. Because they're looking at the same things, they often use the same names for them. It's not Phil making the connection, it's reality making the connection. The difference is, astronomy actually tells us things about the stars and the earth, while astrology fails to tell us anything about how the apparent positions of the stars affect human lives, because of course they don't.
Well, this is gonna be an endless debate. Hen Barrison I don't think any of the connections made add something particularly relevant to the video (especially because they are not accurate). It feels quite mean and free to me. Especially if the point is to say one is silly (without knowing the real mechanic behind it). Neutrality would be better and more respectful to the people, like me, who like both discipline. And if the writers can't stay fair, then they should avoid it. shmaveyea Haha ! That's actually quite funny xD Matthew Prorok Well, It's a little more complicated than that. You seem to be full of pre-made ideas, but you can't explain them properly, because your knowledge in the matter is superficial. Have you study Astrology to be so certain of it's uselessness ? Let me explain how it's working. There 2 main Astrology. One who considers the actual position of the stars, the actual constellations. It's called Sidereal Astrology, and this one takes in count the precession, and so the date of each zodiac sign changes (about 1 degree every 75 years I believe). So what Phil says in the video is false, in this point of view. The second Astrology is called Tropical. And it is based on the Seasons. Not the Stars. So, when the "Sun is in Aries", what it mean is : The Sun is in the part of the sky that he is supposed to be in during the first month of Spring. It doesn't matter which Stars are in the background. It's the "part of the sky" that matters (12 parts of 30° each). I know it's quite confusing, and it's easy to make the mistake, because the 'part of the sky' and the constellations that were there in the past have the same name. But it's not the same thing anymore. Anyway, the point is, again, what Phil says is false, because here we don't care about the Stars and Constellations. So why even making connections ? You see where I want go to here ? When you don't know, don't talk about it. And if you want to talk about it, do your research. Properly. That's all I'm saying. If you believe in Astrology or not, if you think it's working or not, it's a question of "Faith" and that's another topic.
It is not "common knowledge" since not everyone knows it. Only people who are into astronomy, like you (I guess) and I know this very well. However, many others are just "discovering" astronomy and never really looked into it. Did you know 55% (I don't know when that survey was made) of Americans do not know the Earth rotates around the Sun? That's because astronomy is not a topic widely discussed in school (among many others) so no one really cares (not their fault). So someone might be utterly mindblown by this, so please respect that. Many other science channels are very exclusive because you need to know the basics to understand what they're saying, which not everyone does. So to have a channel giving out the "101s" is great! More people will get into astronomy, which I am personally very excited about as it does not seem to be popular with the general population.
This is an intro course. If you are beyond this, watch something that goes deeper into these topics. Don't disparage the videos for providing this information to people who haven't received it yet, however. That is awfully short-sighted.
Yeah a lot of it is the kind of stuff everyone learns in school but at the same time, you have to remember that this is probably watched by a lot of kids who haven't learned this yet so it's trying to be accessible in the early episodes.
You have no reason to act above it all. Good for you that you all of this, but surprisingly enough it might not be the same for a lot of people. If you are unsatisfied, find something that is more suitable for you. Their aim is to educate people, I'd rather not see arrogant people like you trying to make it seem like all the hard work they put into this (to provide you with education free of cost) is in vain. Thank you very much and have a good day.
It is really cool having had taken an astronomy course to see how perfectly aligned in order this material is to the course material I had, great work.
Here i’m watching this instead of studying for my first final exam in med school...... I used to want to be an astronomer... but that dream faded away I guess.......
CrashCourse You forgot to add this to the Astronomy playlist and I almost missed it! In other news, I'm taking an Astronomy class this semester at college, so this channel is super helpful! Thanks a bunch! :)
