Understanding Climate Part 1: Orbital Variations and the Sun 

Flat Earthers are going to love this video xD

Just a heads up - the elliptical orbit at 2:20 is fundamentally wrong. The aphelion and perihelion are opposite to each other (180°), not at 90°, because the sun is not in the center, but at the *focus* of the ellipse (as per 1st Kepler's law). This is a significant difference, as it gives wrong predictions. The earth is closest to the sun once, not twice per year - currently during winter in northern hemisphere. As orbital speed is faster at closer distances (second Kepler's law), the cold two seasons in the northern hemisphere are shorter if you count the days on the calendar.

I love your contents, can I get a comment heart?

Dear Dave, I really love your content. I am going to start studying biochemistry in Oktober, and I often watch your educational videos and your videos debunking pseudoscience. Can i get a comment heart?

I always wondered how you cope with the amount of sheer ignorance, insignificance, stupidity and spite found in youtube comments. I just dropped by to let you know that I appreciate your videos as they make me understand finer details of already assimilated broad concepts and theories. Thanks for your effort.

Brilliant as always. Thank you for your service.

Because of your tutorials, I’m able to get into my ADHD-fueled, obsessive rabbit holes about cool space facts. Thank you, Professor Dave. Real random question: I love looking at pictures of nebulae taken with MIRI/NIR/Ultraviolet cameras to see each detail (unseen stars in the background unobscured by dust, particles, etc). Out of curiosity, What would those nebulae look like from a naked eye POV if hypothetically we were in a spacecraft close to those nebulae? Would we see a lot of dust surrounding those nebulae and light from forming stars lighting up the dust in their centers? I apologize if this question is confusing but I’ve always wondered.

I'd like to have a comment heart too!

Fantastic video, Professor Dave! Now, when we hear climate change deniers claim that we can't discern human impacts on climates versus natural changes, all we have to do is point them to this video. I've tried explaining it to others, but I struggle to make the argument as plainly and simply as you have here. Thanks!

Oh my 1:08 I never thought id be the one to find an error of Professor Dave's videos. Its National Oceanic and Atmospheric Administration. I even double checked before commenting because maybe i misremembered because it happens.

Doing nothing to stave off man made climate change because climate change occurs naturally is equivalent to doing nothing about gun deaths because “we’re all gonna die someday”. My grandkids are gonna be so mad when(if?) they get older.

The amount of people in the comment section who've already pointed out the error with NOAA and the aphelion/perihelion reaffirms my trust in this channel. The viewers and commentors aren't mindlessly noddihg their heads; they're actively correcting the creator on what they got wrong. You'd never see this on creationist/flat earth channels.

Prepare for the comment section to be flooded with AGW deniers!!!

_bUt wHaT aBoUT vOlcAnOeS!!?_ /s

Milutin Milankovic also made calendar called New Julian calendar (Revised Julian calendar) or Milankovic Calendar which is more precise then Gregorian Calendar.

Thank you once again, Professor Dave, for making a complicated subject, very palatable and understandable

The charts in these videos are fascinating. I often pause so I can study them.

When having a discussion about the effects of humans on climate, my father tried to make the claim that the planet gets warmer and cooler naturally in an attempt to downplay human involvement. I showed him a graph similar to that at 7:50 that went back even farther to show how incredibly gradual such natural fluctuations are compared to the obviously rapid jump in temperature we've seen in the past century, and he had no response. Check in with your older family members every once in a while. The damage that organizations like Fox News have done to people cannot be overstated. Come armed with easy to understand graphs like this and fight the propaganda wherever you can.

Thank you, Prof Dave. Good as always. Informative and to the point.

Are climate change deniers next on your debunk list?

Wonderfully done

Thanks teach 🙋🙋🙋

That little opening song/intro is top notch sir.

Love the concise, informative presentation. Looking forward to part 2, very interesting!

7:08+ current global warming is not due to orbital variations nor solar variations.

It's amazing how complex Earth's climate is. Factors from orbital shift to volcanic eruptions are all connected to influence our world.

Thank you Professor Dave for the video ! Best

Would be cool to see a real temperature graph from the space station or a satellite.

Hey Dave, I think there is a small mistake in the diagram at 2:50. I'm pretty sure the perihelion and aphelion are opposite from each other, as in 180 degrees apart, rather than 90 degrees. It's confused me in the past because depictions are often from a skewed perspective, but for an eliptical orbit, the object being orbited lies on one of the _foci_ of the elipse, rather than at the center of the ellipse: so, the earth is closer to the sun than average for an entire continuous half of the year, and farther than average for the other half. Wikipedia seems to agree. The names and definitions are correct otherwise. It's probably also worth noting that what causes the seasons is mainly the tilt of the Earth, because the change in the distance between the Earth and the sun (over a single year at least) is very slight in comparison as are its effects, although that might be a bit off-topic.

おはようございます

This is another video series I'll be watching all the way through, thank you Dave.

Milankovitch cycles need to be a container

Look at this! A coherent model that explains several different phenomena ALL AT ONCE! My my, I know some gents who would LOVE to have such a thing lol.

Hey professor Dave, love the videos keep em coming. I would just like to ask you if it were possible to post in description the scientific articles from which material was taken (so we can dive even deeper in the topic). Don't know if you will even see this but if you will and you manage to do that thanks a lot!

Solar cycle: 12 years Primary school: 12 years Coincidence? Truvago

actually its “national oceanic and atmospheric administration”

Really great video Professor Dave. I’ve always been interested in Geology, Paleoclimatology, and how it relates to Human caused Global Warming. So this was nice to watch. Although I would personally change one thing, and anyone can correct me on this, I think it makes more sense to call those “ice ages” glacial cycles with those warmer periods as interglacial periods. With these cycles taking place in an overall ice age. As there have been five major ice ages in Earth’s geologic history (Huronian, Cryogenian, Andean-Saharan, late Paleozoic, and the current one: the Quaternary Ice Age). But I could be getting my terminology confused but I just wanted to address that. Just so it prevents confusion when talking about different types of climate changes in larger geologic time scales. 👍 Edit: Just a small tweak I would make at 1:11 I think it would make more sense to show the National Oceanic and Atmospheric Administration’s climate normals change from using 1981-2010 to 1991-2020 averages for mean annual temperature and annual precipitation and not just look at 1991-2020 absolute values for mean Temperatures and Precipitation for only the month of April. Either way the point still comes across.

Nice video except that you should have included how the solar variations are on various times scales, some quite long and powerful, not the just the 0.1% short cycle. Also, you do not include the feedback effect of how the Sun's variation influences the influx of cooling galactic cosmic rays (cooling because they lead to more low level clouds which reflect incoming sunlight). Taken into account, these two factors can account for much of the warming of the past century.

NO chance lad, I'm "Boracic" (skint)

wow this guy knows a lot about the science stuff

Here before the wrath of David Weiss 😂

just wanna point out that one of the earths on the excentricity diagram should be INSIDE the circle.

Understandment likes useful informations ツ

Thank you so much for making these videos. You have taught me everything high school failed to.

And before this video becomes the new “how we know the Earth is not flat”

Awesome, very glad you're covering this topic.

You little smart man. You should have said that cities and technology are the main couse. But you chosed a word "human"..

What would be interesting to know is what is the more powerful effect: global warming or the earths distance from the sun? I doubt this has an actual answer, but it is an interesting thought (for me at least). Also is a runaway greenhouse effect, like what apparently happened with venus, possible on earth or would these changes in orbit counter this?

WdYm tHe EaRtH iS fLaT sO tHiS ViDeO WrOnG

Flat earthers are bout to descend again

I find it fascinating how these little changes in the Earth's tilt and orbit around the sun can change the climate accordingly, even if I'm not studying them in-depth these little tidbits are always fun and useful to know! _plus I can already hear the flerfers and climate change deniers typing in the comments section XD_

Love dave

Hmm. Both at 2:37 and 4:00, the elliptical orbit, and thus where more or less sunlight hit Earth, are drawn as if the Sun were at the center of the ellipse, causing 2 perihelia and 2 aphelia per orbit, every 90°. This is inaccurate. The ellipse is off-center. There is 1 perihelion 180° away from 1 aphelion. The drawings at 6:05 get it right. Regarding those last drawings, it should be made clear that the summers & winters marked on them are for the Northern Hemisphere.

Day 1 of requesting Dave to debunk Cross Examined (RU-vid channel led by Frank Turek)

Easy and concise.

very nice video!

Thanks, Dave. The question I had about Earth's eccentricity, obliquity and precession you answered around the 7:00 mark - that our current climate change cannot be attributed to those factors.

your temperature reconstruction of the last 2000 years is wrong for most of the time period. Did you only use selected tree ring data?

Haven't even watched it yet, but I appreciate this series. For my boomer parents, please incorporate info about anthropogenic climate change and what we have done and need to do in order to right through ship. I use your videos in my classes andove your debates with creationists. Keep up the awesome work.

Beautiful graphics that explain the situation so well. Thanks.

Looking at the "newest comments first" I'm surprised no one has been given the pin of shame yet

Ur looking forward to watch Oppenheimer brah?

alright, this topic really requires some coverage and reasonable dumbing down (no offense intended) for the average folks

Thank you for an awesome, scientifically accurate video.

Always pronounced it ap-helion lol

I anticipate trolls

Superb, Dave.

First 🎉🎉🎉

You should debate jon zherka about the flat earth. Nobody challenges his stupid points and he is very popular making a lot of people belive in the flat earth

Don christie

disappointing to see most descriptions of the Milankovitch cycles have been cleansed to promote global warming, or I meant the rebranded ‘climate change’.

Discuss Earths magnetism. Down 30% since 1800.

a guy w 2.5 million subs gets less than 1% of that in views, explain the probability of that.

@professor dave explains Hey Dave! Glad to see you address some of these points. One point I've heard from critics of "the climate agenda" is that the earth has had 3x higher proportions of carbon dioxide than current levels in the atmosphere through several times in Earth's history. They note that these times were also associated with an increase in global flora, and they basically argue that this warming cycle is far better for promoting the health and diversity of life on earth compared to a cooling cycle of freezing. What would you say to people who argue that global warming is a good thing?

If sun is in space, why there is light on earth but not in space?

First

How can Dave who constantly is wrong who put out images and slides that almost all are wrong have so many followers. Are people tht brainwashed?

Dave stop acting like you know ... tell everyone what your qualifications are and where you gained a phd as a astrophysicist 😂😂😂

So over this current political leadership, the climate averages were 'adjusted' outside the frame of responsibility. By a factor of 3 decades.. hmmm...

I can not take seriously any "science" lecture that takes Michael Mann's hockey stick and presents it as factual, sorry. Easy to spot as it stops in the year 2000, making it both false and obsolete.

Fire, the element by which the sun exerts its energy, needs what to burn? Oxygen."

Professor DAVE please have a debate with Jeranism on FLAT EARTH!!

how can anyone know everything you talk about and not believe in God? the sheer intellect in designing such a complex and effective universe within a universe within a universe - it's unparalleled! HalleluYah! Repent and give your life to the Lord!

NOAA is the National Oceanic and Atmospheric ADMINISTRATION, not Association. It is a government agency, not an association. Please lend validity to your presentation by referencing your sources correctly.

Thanks for sharing your knowledge! Hard to gas light people, when they understand the science. Appreciate you!