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!
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!
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.
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″
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?
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!
That scavenger hunt star is Albireo of Cygnus ( the swan ) constellation. But it's actually 19h31m42.1s +28°00'45.5" . I don't know if the values change according to place or time but that's what i got when i searched for the RA/Dec of Albireo to confirm. I live in India.
I get all of that. What I cannot understand is how the equinox is tied to setting 0h RA. Equinox where? Longitude is easy because we know exactly where the Prime meridian is and time is not a factor. But apparently with right ascension the celestial Prime meridian is set toward the sun at the vernal equinox, but the vernal equinox where? At what time? Midnight? Noon? Dawn? Sunset?
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.
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!
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 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.
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.....
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 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.
Alberio . Question is, If the stars are moving how we can say this star is at this palce by just giving co-ordinates. does the co-ordinates move every night
There are different coordinate systems that observers can follow. What I think you are referring to would be altitude and azimuth. Altitude and azimuth change depending on where you are on Earth, while right ascension and declination remain constant for a given celestial object. Altitude/Azimuth: Local, time-sensitive coordinates that describe where an object appears in the sky relative to an observer’s horizon. Right Ascension/Declination: Global, time-independent coordinates used to pinpoint objects on the celestial sphere, analogous to latitude and longitude on Earth.
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?
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.
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.
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.
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.
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.
Sorry but your graph is wrong, declination is degree, arc minutes and arcseconds and right ascension is hours, minutes and seconds, like you have said like 15 seconds before you show your graph.
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!
Thank you 😊
There seem to be errors at the 4:19 and 4:31 mark RA is Hours Minutes Seconds, Declination is Degrees Arcminutes Arcseconds.
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!
This video finally helped me to understand this topic, thank you!
You didn't mention how 0 hour right ascension was fixed? Need technical details about this fixing scheme.
I am really happy to download the stargazing guide. Thank you.
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.
I love this name, Janine! Thank you for sharing this content with us.
Great explanation! I'm new to studying astronomy and the RA/Dec were really confusing me. Thanks for your help!
I always thought RA/Dec was confusing. For some reason, it just doesn't stick in my brain.
Loved the video, spot on. Thankyou for sharing.
And you, will hunt down that star.
I used Stellarium and turned on the grid and the coordinates pointed me to Albireo in the constellation Cygnus.
U r great teacher ..love from india
Great explanation thank you so much 😊❤️
✨Thank you, Sister 🙏✨
Excellent teaching! Now, maybe I can explain some of this to my students :,)
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″
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?
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!
Thanks for watching! New to stargazing? Download my FREE Stargazing Starter Guide: www.learnthesky.com/stargazing_starter_guide
That scavenger hunt star is Albireo of Cygnus ( the swan ) constellation. But it's actually 19h31m42.1s +28°00'45.5" . I don't know if the values change according to place or time but that's what i got when i searched for the RA/Dec of Albireo to confirm. I live in India.
I get all of that. What I cannot understand is how the equinox is tied to setting 0h RA. Equinox where? Longitude is easy because we know exactly where the Prime meridian is and time is not a factor. But apparently with right ascension the celestial Prime meridian is set toward the sun at the vernal equinox, but the vernal equinox where? At what time? Midnight? Noon? Dawn? Sunset?
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.
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!
@IronPump89 Mahalo!
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! 😁
@@learnthesky Aloha! You do a great job! Are you still in Hawaii?
@@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.
@@learnthesky Our loss! Aloha!
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.....
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.
Great suggestion! I honestly made this video to help me remember the difference between the two.
@@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.
Alberio . Question is, If the stars are moving how we can say this star is at this palce by just giving co-ordinates. does the co-ordinates move every night
There are different coordinate systems that observers can follow. What I think you are referring to would be altitude and azimuth. Altitude and azimuth change depending on where you are on Earth, while right ascension and declination remain constant for a given celestial object.
Altitude/Azimuth: Local, time-sensitive coordinates that describe where an object appears in the sky relative to an observer’s horizon.
Right Ascension/Declination: Global, time-independent coordinates used to pinpoint objects on the celestial sphere, analogous to latitude and longitude on Earth.
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?
Albireo, Albireo - Optical Double Star in Cygnus the Swan (and meet my cat!)
@@HiR0SHi.the.D0G My apologies for soiling the task!
Thanks for making this. The Earth rotates so then why do the stars basically keep the same RA and DEC in the sky?
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.
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.
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.
Thank you! Is your favorite star or should I say double star Cygni?
Yes! Albireo is my favorite!
Why not use celestial latitude, celestial longitude, and 360 degrees terrestrial degrees?
Albireo. Thanks for the vid re RA and Dec.
Sister, are you covering astronomy aur aerospace..... .. 🤔🤔🤔🤔🤔🤔
There are errors in the Venn diagram..
I think it is Deneb on the constellation Cygnus
It's not Deneb, but you are in the correct constellation!
@@learnthesky Is it the star Albireo, in Cygnus
It is the Albireo (β Cyg, β Cygni vagy béta Cygni)
Sister I searched your channel for my astronomy and aerospace olympiad observation🧐🧐🧐🧐 problem ...,.......
2:00 Celestial Sphere 🌌🌐
Agree. Great, now I know the terms. WHERE is zero RA? That is a bit of important information not provided.
Where is scutum constellation?
Scutum is surrounded by Aquila, Sagittarius, and Serpens Cauda. Time to add this one to the list!
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.
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.
Albireo Star
Mam.. have you ever thought that the sky can be studied fully by humans...
Beta Cygni Albireo is the star Swan
Sorry but your graph is wrong, declination is degree, arc minutes and arcseconds and right ascension is hours, minutes and seconds, like you have said like 15 seconds before you show your graph.
Albiero
🐫thanks to elaborating in an easy way for the amateur astronomy club.🐓INDIA