Celestial Coordinates

Celestial Coordinates

[@alcatrazeleochestra4146]

In the past, I was a marine navigating officer. This tutorial has helped me to better understand the Celestial coordinates.

[@ashzole]

do your saying as a navel officer , it is just NOW you understand but back then as Navel Officer you didn’t know much and you handled weapons of mass destruction.

[@Truthwelltoldtr]

@@ashzole sure as a “navel” officer he was probably belly surfing with a handheld gps which are used to navigate these days instead of navigating by the stars (which by itself is very cool though)

[@ashzole]

hey alcatraz cleopatra, you know how to navigate by the stars ? Ever see a compass or a been inside a sextent looking for your little dipper?

[@ashzole]

@@Truthwelltoldtr lol

[@bennethos]

This movie made the whole constellation puzzle fall in place for me. Thx !

[@bowrudder899]

The best, clearest explanation I have heard so far

[@danalaniz7314]

Thank you so much for this post. I'm new to studying Astronomy and have been struggling with the concepts of declination and especially right ascension. Your flattened equatorial sky chart finally helped me understand these coordinates so much better.

[@svdido.sailingalbionswater142]

I think it's worth pointing out that the coordinate grid system was realised over several centuries only in order to facilitate mapping and travel across the oceans? It a very logical and defined system that keeps the consensual reality apparent. This explanation is one of the clearest I've seen yet so thank you. It's really appreciated here bud.

[@sylvacante]

Thank you so much for this video Jeffrey, you are an Amazing teacher! You explain in a down to earth manner that you don't often encounter. I am completely new to Astronomy and this has finally sorted out for me these systems of coordinates that are the backbone of all Astronomy, and that you really need to have clear in your head before you can move on. Thank you again.

[@JeffreyHuntil]

Glad it was helpful!

[@thecapnhowdy]

I really appreciate this video, its a nice broad instruction and makes things easy for people to understand...what I find very annoying when it comes to this "construct" of the celestial sphere is that we are told to expect the Sun and planets to move up and down on the ecliptic....BUT WHY NOT JUST KEEP THE SUN AND PLANETS WHERE THEY ARE...and just show THE EARTH TILTING? Which is what really happens! I think this concept has served astronomers since I think it was before even the time of Ptolemy but maybe its time we modernized it? Maybe we just skip the part where the "wanderers" go up over the ecliptic and simply say the celestial sphere is defined at two ponts in the Earth's orbit around the sun, therefore the Vernal equinox and the Autumnal Equinox and then show everyone that it is THE EARTH THAT TILTS AND NOT THE SKY! lol....I mean its such a useful concept but it seems to get bogged down in antiquity...we can in this way KEEP THE CELESTIAL SPHERE DEFINED and steady always, and at the same time keep the sun and planets in the ecliptic where they belong and instead refer to the Earth as oscillating and there we can talk about the Earth's particular "Sphere" instead. Again, I appreciate the video, and all these aids online by good people like you, but I think maybe keeping it real as they say would kind of make things a little more transparent. Of course we would have to PUT THE SUN WHERE IT BELONGS! In the center, but five hundred years after Copernicus, maybe its time...LOL....thanks...caps were just for emphasis.

[@kaustabc7562]

Both of these are equivalent. In OUR frame of reference, the sun appears to be moving so it's highly convenient to just say that. In the sun's frame of reference, we are moving, and that's fine. Both these are mathematically equivalent. So we just pick what is more convenient to us. If you are standing at a bus stop, and a bus speeds by, then in your frame of reference, the bus was moving while you were at rest. But imagine the driver. In his frame of reference, you just moved past him while he sat stationary. So, who is correct? BOTH. Similarly, here too, we all know that the sun isn't actually moving around the earth. But we speak in that way in OUR frame of reference to suit OUR convenience.

[@EyeLean5280]

Instead of telling my students that the celestial sphere is "not real," I tell them it's "how the sky appears" from the earth. The stars * appear * to all be about the same distance and sitting on an inverted bowl, even though we in modern times now know this isn't the case. Basically the celestial sphere represents our visual reality.

[@deanbillman4426]

Who disliked this?!? It’s helpful

[@dw-rh6fb]

This is the best explanation so far I have seen using 3d models. Can you do a video explaining how we see "sliver" moons at *night*. I haven't seen anything about it.

[@MrDunk66]

Thanks, your video really helped me out understanding these coordinates systems.

[@lakhanshahi3637]

Great information video. Thanks

[@greengo9]

You are very good at explaning...thanks for the vid!

[@PaigeWithAnEye]

thank you so much, this was a great help!

[@larspardo4309]

well done - great explanation ... in a calm, measured voice - makes it much easier to understand - & kept to the point......thanks!!

[@atulkabra]

Finally understood. Thanks

[@europah2oalien360]

Thanks for taking the time to make this vid. It really help. Good job!

[@lesliesavage3757]

Very well presented.

[@carlosgranados9301]

Awesome video! This really really helped me, thanks!

[@jaideepkhare5903]

Helped a lot! Thank you very much.

[@compendos]

Great video That helped me alot :) Thank you !

[@Wolfie6020]

Thank you Jeffrey - nice clear video.

[@trollhunter200]

Very clearly explained. Thanks a lot. 👍👍👍👍

[@JeffreyHuntil]

Glad it was helpful!

[@kaushalsheth2574]

Jeffrey you are awesome thanks your explanation was superb.Thanks!!!

[@JackSchlachter]

Great tutorial. Finally the charts make some sense. Do you more on this?

[@doublejizzle7936]

I wanna get a new milky way iBird

[@doublejizzle7936]

It gets coverage everywhere

[@ponthungo]

Very well explained. Now I know what are celestial coordinates. Thank you Jeffrey

[@kbbista2211]

thanks a lot

[@shaggy3375]

Thanks for this. It really helps me out.

[@rogerstankovic2137]

You say that the celestial equator is directly above the earth's equator...do you mean it is in line with the earth's equator as it is just an extrapolation of the earth's equator to the celestial equator?

[@PickledShark]

yes.

[@brewboss58]

I liked this video explanation but I got confused about the last section on the polar chart where you said that the chart was cut off at 60% and that it should go to 90% but I didn't see room for that on your chart nor did I see degree markings. I counted the lines and so I'm guessing that that's what you were referring to. Sorry I just started viewing the sky on SLOOH and was trying to understand the coordinates. Thank you for your posting which gives me some reference now.

[@JeffreyHuntil]

The polar chart shows the sky from 30 degrees N to 90 degrees -- the north celestial pole. The circles on the chart at 10 degrees apart, starting with 30 degrees as the outside circle. The point at the center is 90 degrees -- the celestial pole. Thanks for your question seeking clarification.

[@shesoonstar90]

The Corona Virus lambda Variant brought me here. Thank you for the info.

[@MaryamTajalli]

Such good explanation. thanks a bunch.

[@ASHWINHARMALKAR]

superb explanation....thanx alot jeffrey

[@ahmedalshaibi6569]

thant u so much ! I am wondering if anyone knows what you have to generate the (coordinate system, etc) for a completely new planet !which we dont have any informations about it ! what we need and how ? to do that ?

[@prafullachandra2050]

Does the position of equinox, change with respect to the constellation over long periods of time?

[@kshitijsharma4624]

Yes, it precesses with a period of about 18k years

[@usernamemykel]

Superb!

[@primtourist]

Thank you for this video!

[@oliverargires]

Hello sir, Is there anyway I can project one celestial coordinates onto earth and find the terrestrial ones? at one specific time.

[@JeffreyHuntil]

Theoretically, yes; At least two issues (1) The celestial equatorial system's longitude is measured in hours and minutes, rather than degrees. 1 hour of right ascension is 15 degrees. (2) The celestial system is measured eastward from the vernal equinox, coordinates 0h, 0 degrees. The terrestrial coordinate system is measured eastward and westward from the 0 degree prime meridian. (others) Further the starting points 0h, 0 degrees on the sky does not match up with the 0,0 on the earth constantly. So knowing the date and time is essential for that conversion. Latitude is easy to determine -- look straight up during any time of the night. Any star that is there indicates your latitude. Look up the star's declination. That's your latitude.

[@oliverargires]

@@JeffreyHuntil thanks for your reply. I also found handy the "azimuth grid" of Stellarium app. The center of this grid is the vertical from earth to sky.

[@JeffreyHuntil]

@@oliverargires Also note that the equatorial grid as well as the ecliptic grid are in stellarium as well. The equatorial grid is the system that your original question referenced. The azimuth grid references the direction and height above the horizon to the celestial object. The alt/az system is time and date dependent. The equatorial coordinates are essentially constant over time (although subject to precession), but for our purposes here unchanging. Thanks for your questions! -jlh

[@oliverargires]

@@JeffreyHuntil you're right, thanks!

[@milongamia]

I liked your video very much. My question is not related to this video, but if you could please help: How do I locate a star with RA and declination numbers (coordinates)? Thank you in advance.

[@bsellers8086]

L.A. yes I'd also like to know as I just got a new telescope. let me know if you found out how please

[@Ganeshprasadbhatta]

Thanks for the video.

[@fordtoy2000]

Purty cool. Thank you.

[@abdihashi2310]

nice video. thanks

[@edhienatadiredja4258]

Good video, thanks

[@synckid9061]

How can you see a full celestial hemisphere when your 90 degree perspective to horizon would be obstructed unless your were at the 0 degree latitude standing at the center of the earth with your zenith at 180 degrees over head?

[@adalbertleitao440]

Thank you

[@isaacreeves3421]

Top Video!

[@TrueHamal]

At the 04:20 minute, the Celestial Sphere in colors.

[@savita11011975]

very good

[@muneshagrawal643]

Hello savita madam How r u and your ca

[@sauravkumar-jb1le]

Savita Rani u r welcome savita

[@RolmeO]

thanks

[@unarammer2003]

can you say firmament??

[@eMBO_Gaming]

Why should he say fake information in the video about the celestial sphere?

[@unarammer2003]

@@eMBO_Gaming like earth is a warp speed traveling water ball???gtfoh

[@eMBO_Gaming]

@@unarammer2003 Nope, the fact that the Earth is what you just caricaturally described is the reason why the celestial coordinates are possible in the first place.

[@unarammer2003]

@@eMBO_Gaming sun worshippers disgust me...take your talmud and use it for toilet paper like I do,put it to some good use...

[@eMBO_Gaming]

@@unarammer2003 If your mental capacity is so retarded, that after hearing that the Sun is the centre of the solar system the first thought that comes to your brain is to fucking worship it, it's not the problem of the reality, but rather your brain. When solar eclipse happens, do you also run away terrified, that satan ate it?

[@PARTHASARATHIJS]

Celestial sphere is not actually sphere. It is egg shaped elliptoid.

[@avibank5115]

Thank you