Right Ascension versus Declination

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Learn the similarities and differences between right ascension and declination, which are both types of celestial coordinates.
Chapters:
0:00 - Introduction to Right Ascension and Declination
2:00 - Animation of Celestial Sphere
2:56 - Definition of Right Ascension
3:28 - Definition of Declination
4:07 - Venn Diagram comparison of Right Ascension and Declination
5:55 - Shadow of Mauna Kea (from my days as a volunteer in Hawaii)
6:31 - Scavenger Hunt Challenge -- Find the star and video about it on my channel
Links and Resources Mentioned in this video:
▶ Lyra Constellation: bit.ly/LearntheSky-LyraHarpCon...
▶ Albireo Star: bit.ly/LearntheSky-AlbireoStar...
▶ Download Free STARGAZING Guide: www.learnthesky.com/opt-in-st...
Playlists
▶ Stargazing Basics: bit.ly/LearntheSky-StargazingB...
▶ Zodiacal Constellations: bit.ly/LearntheSky-ZodiacalCon...
▶ Circumpolar Constellations: bit.ly/LearntheSky-Circumpolar
▶ Winter Constellations: bit.ly/LearntheSky-WinterConst...
▶ Spring Constellations: bit.ly/LearntheSky-SpringConst...
▶ Summer Constellations: bit.ly/LearntheSky-SummerConst...
▶ Autumn Constellations: bit.ly/LearntheSky-AutumnConst...
▶ Stars: bit.ly/LearntheSky-Stars
▶ Planets: bit.ly/LearntheSky-Planets
▶ Celestial Objects: bit.ly/LearntheSky-CelestialOb...
▶ Versus Videos: bit.ly/LearntheSky-VersusVideos
▶ Celestial Events: bit.ly/LearntheSky-CelestialEv...
▶ Citizen Science: bit.ly/LearntheSky-CitizenScience
Photo Attributions
▶ Corvus Map: By IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg) - [1], CC BY 3.0, commons.wikimedia.org/w/index...
▶ Sydney Hall - Urania’s Mirror: By Sidney Hall - This image is available from the United States Library of Congress’s Prints and Photographs division under the digital ID cph.3g10053.This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information., Public Domain, commons.wikimedia.org/w/index...
▶ Antennae Galaxies - NGC 4038 and 4039: By By ESA/Hubble, CC BY 4.0, commons.wikimedia.org/w/index...
▶ NGC 4361: By Credit Line and Copyright Adam Block/Mount Lemmon SkyCenter/University of ▶ Arizona - www.caelumobservatory.com/gall..., CC BY-SA 3.0 us, commons.wikimedia.org/w/index...
▶ Constellation Photos: Akira Fujii - The Constellations www.davidmalin.com/fujii/gener...
▶ Lyra Constellation Map: By IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg) - [1], CC BY 3.0, commons.wikimedia.org/w/index...
▶ Right Ascension and Declination Animationr: By Tfr000 (talk) 20:50, 17 April 2012 (UTC) - Own work, CC BY-SA 3.0, commons.wikimedia.org/w/index...
▶ Right Ascension and Declination Diagram: By Tfr000 (talk) 15:34, 15 June 2012 (UTC) - Own work, CC BY-SA 3.0, commons.wikimedia.org/w/index...
▶ Ursa Major Constellation Map: By IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg) - www.iau.org/public/themes/cons..., CC BY 3.0, commons.wikimedia.org/w/index...
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Опубликовано:

3 июл 2024

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Комментарии : 59

@englishforfunandcompetitio248 Год назад

You didn't mention how 0 hour right ascension was fixed? Need technical details about this fixing scheme.

@danalaniz7314 2 года назад

Great explanation! I'm new to studying astronomy and the RA/Dec were really confusing me. Thanks for your help!

@learnthesky 2 года назад

I always thought RA/Dec was confusing. For some reason, it just doesn't stick in my brain.

@senthilnathanviswanathan4924 2 года назад

I am really happy to download the stargazing guide. Thank you.

@jpadicecoffee9812 Год назад

I enjoy these guided videos; it helps me recall where the specific star, clusters, and constellation in the sky if I know more about them and next to other things.

@abdurrahmaandesai8473 2 месяца назад

This video finally helped me to understand this topic, thank you!

@carman3894 Год назад

I used Stellarium and turned on the grid and the coordinates pointed me to Albireo in the constellation Cygnus.

@marccanales2630 2 года назад

You took my breath away...I am a very visual learner and hearing others talk and talk about RA and DEC totally burst my bubble...you used these cool graphics and now thanks to you, I understand...thank you so much..you won me as a subscriber..blessings to you!

@learnthesky Год назад

Thank you 😊

@learnthesky 2 месяца назад

Thanks for watching! New to stargazing? Download my FREE Stargazing Starter Guide: www.learnthesky.com/stargazing_starter_guide

@hmabboud Год назад

I love this name, Janine! Thank you for sharing this content with us.

@shivamchouhan5077 Год назад

Great explanation thank you so much 😊❤️

@peterthedoodler8435 Год назад

Loved the video, spot on. Thankyou for sharing. And you, will hunt down that star.

@larafabilo 11 месяцев назад

I entered the star coordinates into a website and it showed me a sky map image of that coordinate. I zoomed out and recognised the nearby constellations of Lyra the harp and Sagitta and arrow. From this I realised I was looking at the star at Cygnus the swan’s head. And searched it up on Sky Academy app to find out it’s called Albireo. Thank you Janine for teaching me about RA and Dec!

@jamesmichaelsimmons Месяц назад

There seem to be errors at the 4:19 and 4:31 mark RA is Hours Minutes Seconds, Declination is Degrees Arcminutes Arcseconds.

@bertquijalvo7152 3 года назад

Albireo, Albireo - Optical Double Star in Cygnus the Swan (and meet my cat!)

@bertquijalvo7152 3 года назад

@@HiR0SHi.the.D0G My apologies for soiling the task!

@leif3925 Год назад

Excellent teaching! Now, maybe I can explain some of this to my students :,)

@senthilnathanviswanathan4924 2 года назад

Your video is simple and educative. You have mentioned that milkyway could be seen with unaided eye. But I never saw such a grand spectacle. To see the milky way with unaided eye, what should I do?

@learnthesky 2 года назад

Try to get away from city lights and light pollution. The Milky Way is best seen under dark skies. Also avoid a full moon, it’s light will be too bright. New moon phase is best to see the Milky Way. Good luck!

@gabedarrett1301 Год назад

1.) You forgot to mention that 0 hrs right ascension is where the vernal equinox is. 2.) It's hard to visualize RA/Dec as the earth orbits the sun. Why is earth at the center of the celestial sphere? Could we use the sun at the center instead? 3.) Why is right ascension measured in hours instead of degrees?

@utubesgreat4me Год назад

Albireo. Thanks for the vid re RA and Dec.

@rogertootkaylok5716 Год назад

Thank you for the teaching on this particular astronomical explanation. I've known these words and phrases since perhaps as a little boy, maybe in the latter grades as was taught in school .? I don't know how old I was then. This was as when I lived in Fairbanks, AK. being raised by a married couple. C/O RDRT.....

@csetetamas76 Год назад

It is the Albireo (β Cyg, β Cygni vagy béta Cygni)

@alanalain4884 2 года назад

Useful video, thank you, but as a total beginer I don't understand where the 0h00 is located. Is it aligned on Greenwich Meridian (London) ? Thank you for any insight or video link suggestion.

@OrdenJust Год назад

Is this correct? At 4:24 you show declination measured in hours, arcminutes, and arcseconds. Should that be degrees, arcminutes, and arcseconds? For example, Betelgeuse is listed as RA 5h 55m 10s | Dec +7° 24′ 26″

@Riyad7 5 месяцев назад

Great videos....I liked all your videos. You are great Teacher and your students are lucky to have you. But may I put a small correction in this Video I think the declination is measured in the degrees (°), minutes (′), and seconds (″)...not in hours.

@fopeezy3097 Год назад

I am brand new to astronomy. This video was helpful. Noob question: But at the end you give coordinates to find a star. Doesn't this value change daily? I.e., if I give you a coordinate of a star, won't it only be at the coordinate for a small period of time? Maybe I am not thinking correctly.

@I_dreamed_my_name_was_Brandon 10 месяцев назад

Right ascension is comparable to latitude, declination is comparable to longitude. You have those reversed. In fact, quite a few charts online seem to confuse latitude and longitude, which is a bit worrisome....

@learnthesky 10 месяцев назад

No, I did not reverse it. Right ascension is comparable to longitude, and declination is comparable to latitude.

@stephenweber33 11 месяцев назад

What if you explained how to find ascension from the ground. Like Degrees from the North star. Looking for video to that point. But excellent ground work on the terms. I would have loved to find this first.

@learnthesky 10 месяцев назад

Great suggestion! I honestly made this video to help me remember the difference between the two.

@stephenweber33 10 месяцев назад

@@learnthesky I find that the math is clear if not always showing the bias against describing itself with the North Star. Yet for example , I am interested in the galactic center, Which with the math gives a point on the sky for the core. And then the video stops. I am interested in non electronic methods. So OK. I know that the answer is simple in that that point rotates around our North Star. I take that each day is one day of a year and the cycle that makes a star just a point in the sky. But at night. How to add to the calendar gods to find the exact Center of the Core of the Galaxy along this know circle of space that it circles in, Much as I would describe the view of the Electron. But thank you for your video, and future such helpful work.

@Discipleninja 2 года назад

Thank you! Is your favorite star or should I say double star Cygni?

@learnthesky 2 года назад

Yes! Albireo is my favorite!

@Anishkrsinghiit-jee 2 года назад

Sister, are you covering astronomy aur aerospace..... .. 🤔🤔🤔🤔🤔🤔

@bryanchambers1964 7 месяцев назад

Thanks for making this. The Earth rotates so then why do the stars basically keep the same RA and DEC in the sky?

@learnthesky 7 месяцев назад

Think of RA and Dec as Earth’s latitude and longitude projected onto the night sky. Each place on Earth has a designated lat/long, and it the same for the night sky.

@Anishkrsinghiit-jee 2 года назад

Sister I searched your channel for my astronomy and aerospace olympiad observation🧐🧐🧐🧐 problem ...,.......

@EffySalcedo 3 года назад

2:00 Celestial Sphere 🌌🌐

@MrIzmirli35 2 месяца назад

Albireo Star

@richardforee1342 3 года назад

Aloha and mahalo! I want to point out something that's kind of confusing for me. When you introduce Def Rt/Ascension at 3 min, you state that it is measured by (Hours, mins, sec) and nothing about (Degrees). However, at the 4:25 mark, your sphere for Rt Ascen measures this using the metrics of (Hours, degrees, minutes). Where/when did the "degrees" come in? It's the same, but reversed of course, for Declination. At the 3:35 mark, the metrics for measuring Declination are (Degree, arcmins, arcsec), but at the 4:25 mark, the metrics listed are (Hours, Arcminutes, Arcseconds) with no mention of degrees. I found this video super helpful, but I found the aforementioned confusing. Mahalo Nui!

@richardforee1342 3 года назад

@IronPump89 Mahalo!

@learnthesky 3 года назад

Hi. I see how this is confusing, and you are correct, I did put the incorrect measurement on the Venn Diagram. To be clear, Declination is measured in degrees, arcminutes, and arcseconds. Right ascension is measured in units of time: hours, minutes, seconds. My apologies for the confusion...I may need to republish in this one! 😁

@richardforee1342 3 года назад

@@learnthesky Aloha! You do a great job! Are you still in Hawaii?

@learnthesky 3 года назад

@@richardforee1342 No, I moved back to my home state of PA in 2019. It was the right move for my family. I miss Hawaii a lot, and once the pandemic is over I hope to visit again.

@richardforee1342 3 года назад

@@learnthesky Our loss! Aloha!

@stargazerskingdom1901 3 года назад

I think it is Deneb on the constellation Cygnus

@learnthesky 3 года назад

It's not Deneb, but you are in the correct constellation!

@stargazerskingdom1901 3 года назад

@@learnthesky Is it the star Albireo, in Cygnus

@Landoparada360 2 месяца назад

Why not use celestial latitude, celestial longitude, and 360 degrees terrestrial degrees?

@kittyinfinity56 2 года назад

There are errors in the Venn diagram..

@ramachandramoorthy682 3 года назад

Mam.. have you ever thought that the sky can be studied fully by humans...

@dushyanth1556 3 года назад

Where is scutum constellation?

@learnthesky 3 года назад

Scutum is surrounded by Aquila, Sagittarius, and Serpens Cauda. Time to add this one to the list!

@noneyobusiness8289 2 года назад

Albiero

@MariaMartinez-researcher Месяц назад

This video does not even mention how time must be considered regarding right ascension. Earth spins. Therefore, every star's right ascension changes every minute? Is right ascension somehow fixed? Fixed to what? If not, how is the coordination between astronomers achieved? "Let's see the star that will be at XX declination, XX right ascension, at 17:35 UTC"? Also, the figure shows the ecliptic does not coincide with the declination/latitude pattern. How that influences the location of any celestial body that travels that path, specially the ones that have a retrograde movement? Still unsolved mysteries.

@learnthesky 23 дня назад

I think what you are thinking of is altitude and azimuth. RA and Dec are the same for every star, no matter where you are on Earth. This means that the position of a star stays the same from night to night. But altitude and azimuth are only used in one place; each viewer sets up their own frame of reference. The altitude and azimuth of a star will change in just a few minutes as it appears to rise, move across the sky, and then set.