Polaris: The North Star
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- Опубліковано 19 чер 2024
- Polaris is one of the most important stars to identify in the sky because it points due north. Learn how to find this star, the precession of the equinoxes, and details about its multi-star system.
Chapters
0:00 - Intro
1:08 - The many names of Polaris
2:00 - Polaris is NOT the brightest star in the sky
2:23 - How the Find Polaris
5:22 - Polaris is a Triple Star System
7:11 - Why the North Star appears to be stationary
8:06 - Precession of the Equinoxes
10:15 - Review of Polaris
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Photo Attributes
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▶Precession of Earth’s Axis: By NASA, Mysid - Vectorized by Mysid in Inkscape after a NASA Earth ▶Observatory image in Milutin Milankovitch Precession., Public Domain, commons.wikimedia.org/w/index...
▶Procession of the Equinoxes: By Tauʻolunga - self, 4 bit GIF, CC BY-SA 2.5, commons.wikimedia.org/w/index...
▶Star Trail: By Ashley Dace, CC BY-SA 2.0, commons.wikimedia.org/w/index...
▶Polaris A and B: By NASA/HST - hubblesite.org/newscenter/news... (Image: STScI-2006-02), Public Domain, commons.wikimedia.org/w/index...
▶Polaris System: By NASA/ESA/HST, G. Bacon (STScI) - hubblesite.org/newscenter/news... from en.wikipedia to Commons., Public Domain, commons.wikimedia.org/w/index...
▶Gyroscope Precession: By LucasVB - Own work, Public Domain, commons.wikimedia.org/w/index...
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My 6 year old has been watching your videos for over an hour now and you have his full attention. Very informative thanks!
Thank you so much for letting me know. As an educator, it lightens my heart knowing younger kids are interested in this material. I'm glad he enjoys it!
So glad there are kids interested in these things. Best wishes to you and your son! He’s going places.
awesome
Kristen Parsons ok I agree with your six year old
Learn the Sky im 12 and I also live ur vids
This was extremely helpful! I had a hard time understanding my teacher but you explained it well!
Thank you! I'm glad this was helpful.
When you were talking about following to pointer stars to find Polaris, if you keep going you can also find Cassiopeia
Yes, you are correct. Thank you for adding this detail. Recently my sister got a tattoo of the Big Dipper, Little Dipper, and Cassiopeia, and when we were placing the tattoos, we made sure to line up the stars correctly! :)
I'm happy to hear that finding the little dipper isn't as easy as people make it out to be. I have find the big dipper and polaris but i cant ever tell which faint star to track for the little dipper. always just looks like 3 stars to me like she says. People sure had imagination when they decided to make that pattern a little dipper. I for sure would have made that the triangle in the sky lol.
Thank you so much for this educational video. I've watched quite a few on this topic. Yours is great.
Thank you very much, finally an easy to understand video with clear illustrations. Using the cursor made it easy to follow your presentation.
You just helped a frustrated old man who wanted to learn about these constellations. God Bless
Simply awesome.. learn more than I expected
Wow! Thank you for this awesome video! We are studying astronomy and my boys loved this and learned so much. I love how you included so much information and made it all so interesting.
I've also watched your video and found it very helpful and to the point. Like the comment about the 6 year old child, in contrast, I'm 72 and you had my full attention. Hopefully you'll have more videos for us. Thank you!
Thanks so much; Your style is clear and engaging!
Thank you so so much. Very clear explanation!
Thank you for this very helpful video. The illustrations were particularly helpful.
Magnificent explanation with this and your other videos. Most interesting. Thank you.
This video was very helpful!I’ve always been interested in astronomy and space, anything to do with the universe, since i was little.I’ve been trying to find some information on Polaris for inspiration for a song i’m currently working on, but wiki just wasn’t doing it.In your video, not only did i get facts i can creatively use, but was also able to learn so much in just minutes!Thank you, and i hope this channel grows.Subscribed.
I'm a little late with this reply...my apologies. I'm glad this video inspired you. I truly believe viewing the stars helps spark our creativity. At least it does for me! 😀
Thanks for providing a very clear presentation.
Thank you. This is very informative
I enjoyed this and I learned a lot. Thank you for explaining this in a very articulate manner. Time well spent on knowledge that will serve me for the rest of my life. You are a prime example of why the internet is so beneficial. 10/10 sub earned. Thank you very much for making this video!
Explained very well. When you look at the stars in the sky, you always navigate to that star it pulls you to it. That's why questioned it thank you for your exploration of knowledge of the North Star 🌟
Nice. Lovely clear graphics
Excellent presentation!!!
Very helpful thanks, slan....
My country is sri lanka which is situated 6 degrees north from equator. As northern horizon is visible to my home area , the north star polaris is visible from my garden.it is visible in northern sky approximately 6 degrees above horizon. So it proves what you had told in this video how someone finds latitude using polaris , is absolutely true. And it proves sri lanka belongs to northern hemisphere too.
thank u this is so infourming !
thank u, means somethinf to me, when I see that they planned out this place on earth, called Prospect Cemetery so it is a wounder to behold, amd they called remeberance day here the festival of lights,, they set up the moon and sun, yes here with the constalation, so many many, do not understand true North? so sad as man is building without thinking green!
Okay this night I'll surely be able to find the north star coz I understand how to find it just by your well explanation. Thanks dear
this was very interesting and easy to grasp, add the sun chart plan and u got it ,
🤔🥰 How interesting. Thank you very much
Thank's a lot for these videos very very very didacticts. Than you very much
Thanks Mam ! Informative article
We're exceptionally lucky to live in a time in which there is such a bright start dead-center above the pole.
I totally agree.
Thank you for your time. That was very good. I grew up in New York City. I went to the Pacific being a Marine and I fell in love with the night sky and all the stars I had never ever seen as a result of living In NYC. Actually while in Viet Nam, I often took solace in the night sky and its stars. Navigation was a big part of my job while in a jungle and using a compass. As a result, I decided to teach myself celestial navigation. For me it was a natural evolution of what became a passion. I do have a question. I have no problem finding the north star. I use Ursula majors pointing stars. However, my confusion stems from the fact that you as well as others state it is a part of Ursula minors handle. I currently reside in western Mass. Here comes my question. If I am facing west and I look towards my left ( south ) the lil dipper is in the Southern sky. Polaris is Not part of its handle and if I change my direction to face Right. ( North) I find the large dipper, I locate the two pointing stars follow them and Bingo. There is Polaris. For me , the Lil dipper is located in the southern sky and the big dipper is located in the northern sky. Polaris is no way near the lil dipper ( south) nor does it connect to its handle.
By the way. It is March 28, 2021. is it because its attachment to Ursula minor is seasonal ? and I agree Polaris is not the brightest star in the sky .
Thank you in advance and thank you for your time..
SemperFi.
In the late 70s I made a site glass out of a 2 inch pipe about 2 feet long, I at each end I had a large washer with a 1/2 holes. For about 10 years I would ckeck to see the North Star, it was always there. I moved to Florida in 1988. For any of you Star gazers this is a neat way to get kids interested.
Can u explain a lil more. Im not understanding this concept
excellent !
Thank you
Thank you. 🙏
Imaged Polaris few days ago and saw both Polaris Aa Polaris Ab and Polaris B.
Bizar, as I wasn't aware that Hubble only discovered Ab in 2006!
thanks very helpful had no trouble finding the north star thanks to u do you have a video on finding alpha centuri?
Robert Madrigal I do not have one yet, but I will add it to my growing list if video requests. :)
Something I don't understand, the earth is travelling around the sun and yet the earth is also turning aswell as rotating on an axis, and also our solar system is meant to be spiraling through out space, so given all this motion, why does Polaris always remain in the exact same position above the north pole?
😂
thank you.
banging tunes
cheers! my friend from college composed these tunes. I still love listening to them.
Love you
I love the video
Someone explain to me why we can still see north star when where on the other side of the sun facing the opposite direction to the north star?
If you think the solar system like a disk, you would see Polaris on top of that disk so no matter where the earth is polaris is always on top, of course Polaris is not seen in the southern hemisphere cause the ligth from the start never reaches it, there are some constellations that we do not see in the summer but appear in the winter like orion's belt this happens cause like you said at some point we happen to be to in opposite side of the sun so the ligth from the star hits earth in the day time and the suns outshine the stars so we do not see them.
Because The earth is flat , it's not a ball 🏈🏀 not round
Yes pls
I don’t even know, it’s all probably a simulation anyway
@@adomadam
2 poles means 2 points of axis.
Cool lesson. I had no idea Polaris is a trinary star system. I do have some news for you though. Nat Geo says, "In fact, the North Star-also called Polaris-is 30 percent closer to our solar system than previously thought, at about 323 light-years away, according to an international team who studied the star's light output.
Using Russia's 6-Meter Telescope, the researchers were able to calculate the North Star's distance from our solar system by analyzing its spectrum of light and obtaining data on its temperature and changes in intrinsic brightness over time."
thanks
This was very informative. Do you have any videos on stars in the south pole? I can google it but wanted to ask here in the meantime.
I have one on the Southern Cross with can be used to find the southern celestial pole. ua-cam.com/video/yGAT5iMkcP0/v-deo.html More video about the Southern Hemisphere will be coming soon.
Hi, great video. Is there no fixed star above (or beneath) the South Pole as well? and what does the sky look like from the South Pole?
Hello. The star that is oriented above the South Pole is called Sigma Octantis in the constellation Octants, but its magnitude of 5.5 makes it a pretty faint star to see. I live in the northern hemisphere, so I am pretty unfamiliar with the southern sky. You gave me an idea for a new video this topic, thanks!
Don’t know why but in our schools Polaris was emphasised a lot and taught how to spot it in sky at early age.
I emphasize this a lot when I teach my students as well. It is the one star that does not move in the sky. It is important for navigational purposes.
@@learnthesky
It does move,, it's not centre.
I am following from Mexicali Baja California MEXICO.
Cool Video, can you make one of Gemini? im not sure if you already made it, thats the one im learning atm greetings.
Hello! Yes, I am working on one for Gemini. I just need to record it. I'll bump it up my priority list :)
Learn the Sky
ty soo cool
So if i buy an equatorial mount now, i can not use it after 1000 years? 😆
love your videos btw! thank you!! 🙏
It would be great if you could give us distances between the big dipper and the little dipper for eg also no mention of Polaris A ,B and AB so triple star system does this solar system have planets????
What an awesome video, you make it fascinating and very clear. Probably a silly question but I was wondering why the North star perceived alignment with the North Pole is not affected by the rotation of the earth around the sun. Is it because the angle variation is negligible because the earth orbit of 1.6x10-5light years is very small compared to the 434lightyears distance to the North star? Also don't the galaxies and stars move in relation to each other? Thanks for making these!
Hi there, I'm glad you these videos are helpful. Polaris is situated right above the geographic north pole, so it appears not to change its position. But you are right, all stars and galaxies are moving through space time, and most objects appear to be moving away from us (known as red shift). It is a complicated subject for sure! Another way to think about it is if you were standing on the geographic north pole (magnetic north is a whole different thing), and holding a flashlight pointing straight up, the shining light would point almost exactly towards Polaris. I hope this helps!
Learn the Sky thanks for your comprehensive response!
no stars a moving, it just appears that way because of earth rotation but it's a wonder how people were able to navigate considering earth also orbits the sun and on each of those 365 periods of 24 hours, Polaris should appear in a different position. You might see the north star tonight, but where should it be in 6 months?
In the constellation ursa minor polaris isn't the brightest, Kochab is... this is how I find the Polaris, first I find the kochab in the north direction and then I find it on the right side.
it is also used to plan structures?
re: the northern hemisphere, when the north pole is tilted towards the sun it is summer and Polaris is strait above but what happens when the northern hemisphere is tilted away from the sun (winter), is Polaris still strait above or not.
It is tilted in the same direction the entire year. When there is winter in the north there is summer in the south and vice versa.
How can you say the stars APPEARS to move when we can clearly see them moving around polaris?
Domino Effect the movement you can see is from the Earths movement not the stars movement.
@@aw7245 How do you know?
@@kongmik classical mechanics
@@aw7245
Very simple
just as sirius points to pollux from canis?
The wobble must have something to do with the elliptical orbit of earth, because if you've ever played with a fidget spinner it moves freely in any direction as long as all parts remain oriented as they were originally, but any force attempting to move the orientation diagonally at the center of gravity is resisted asong as force is applied and then once force is removed it stops resisting and stabilizes. Now the only force that I can think of that would put those kinds of forces on something with the mass of a planet would be its host star, the sun is moving around something as well as the earth and with much greater velocity and it too has it's own rotational energy even if we cant see it, I mean for anything to remain in a stable path in the vacuum of space it must have some form of spin either parallel or perpendicular to the direction it's going, otherwise it wouldnt have any stability at all and the whole system would collapse, gravity requires mass but its counter part.. repulsion requires energy applied to that mass. So as the sun tows the solar system along the planets with their respective orbits perpendicular to the trajectory of the sun are only repelled and stabilized by their motion and the connection between planet and sun has lag since it isnt an impossibly rigid structure like gears, bushings, rods, and so on, and so the verry gyroscopic stability they have that keeps them oriented properly to maintain their orbits causes drift, or lag in the gravitational pull of the host star. The planets each fall ever so put of sync with the sun at their furthest positions away and the more out of sync they get the less stable they become and once the right degree of angle is met in this slowly approaching offset the planets get pulled in against their repelling force and that attracting force from the sun applies torque to the stable axiom which synchs it with the sun and allows it to be pulled in with greater speed and it's new orientation acts as a break to prevent over setting its position and being thrown out of orbit.
Why are the stars in Ursa Major and Ursa Minor and other constellations growing more fainter every year? I live in Klamath Falls Oregon, and I only noticed that only the Orion's belt constellation is more prominent. More pronounced in the sky. Why is that?
It is hard to say. My first guess is that light pollution from artificial lights has increased so much over the past few decades that the stars are getting harder to see. As to why the belt seems more pronounced...that I am not sure. When the constellations are closer to the horizon, they can look bigger from our perspective. I found an article explaining this phenomenon (it uses the moon as an example): solarsystem.nasa.gov/news/1191/the-moon-illusion-why-does-the-moon-look-so-big-sometimes/
I hope this helps.
Unless Google Earth is wrong, the diagram no 7:42 inaccurately shows the placement of the Tropics and the Equator. No biggie but just so that there is no confusion.
rashrealmdotcom Wow! Great catch! I didn't notice that picture's inaccuracy when I purchased it. Thanks for pointing that out.
Hey, you published this on my 23rd bday, I feel special lol
So what was the North Star when Jesus was born?
Brant Wade The north star is the throne of God. Rev 4:3
Does Polaris have any planets in its star system?
Ok and Ok
Don’t we have to be facing north before we can even begin to look for Ursa Minor and Major?
yes. definitely.
heat affects gravity? the tide? question a grade that shades nothing is natrual?
God of constellations
I found Polaris in the sky, I live in Houston, Texas
I live in Dallas, Texas and it's common
How do researchers find the masses of stars? How do you know that polaris is 4.5x the mass of the sun?
I know Polaris, that Star is like a beautiful star in the Northern hemisphere sky
Halloween Fan 2005 AUTTP
Polaris is pretty average in brightness: only +2 magnitude.
How to find that pointer star?
There are a couple of ways for find Polaris. One is by using the Pointer Stars in the Big Dipper, which are the last two stars in the cup portion of the dipper. The other way is to use the three middle stars of the Cassiopeia 'W'. The middle of the W points to Polaris. I hope this helps!
I don't understand if Polaris is nearby stationary and the earth is spinning around the sun , then how we still see polaris always in the center of the north, is it rotating with the earth around the sun ?
The position of Polaris happens to be aligned with Earth's northern axis at this point in time. In other words, the Earth's northern axis is tilted towards Polaris, however this will not always be the case. The Earth's axis is moving in a circle, and it completes this circle every 26,000 years. This is called the 'Precession of the Equinoxes'. This is can be a difficult thing to explain through words, so I recommend looking up some videos on this topic. I especially like this one because it shows and explains the mechanics of why this phenomenon occurs: ua-cam.com/video/0qHjtp4cdCA/v-deo.html
💜
How to look for Polaris, face North & find that star
I've been to Polaris....friggin hot!
It doesn't make sense, if we are revolving around the sun, why the Polaris always appear at north celestial pole?
so people south of the equator cant see the north star?
Yes, they cannot see the north star.
Spinning orbiting & hurtling through space yet the same stars visible for 12,000 years!?
But they change orientation over time as viewed from Earth. Example: Polaris is the current pole star for the northern hemisphere. During the time of ancient Egypt, it was Thuban as described in hieroglyphs and other ancient Egyptian writings.
ReneeNme they would change every night!
@@P.H.888 The fact that you can't understand basic astronomy isn't on me, that's all on you. Educate thyself.
ReneeNme that’s why the science has changed to support the science fiction in people’s minds.
The age of the universe had to become older & older!
The distances have to become greater & Greater!
Because it’s just theoretical then somebody comes up with a discrepancy so they have to plug it with more imaginary ideas!
Like having stars 38 Million light years across just so they can be seen !?
It’s total nonsense!
P Harrison Your either mislead or an idiot, either way you have my sympathies.
astronomy and astrology were always for navigation purposes
That dog in the background tho
Could you still see it if you were right in the middle of Antarctica?
No.
so easy now to see it the master plan.>3 for your habitat? where you have inclination angles, and an inverted vally, if you do not plan it right u will destroy the natural capacity of the land to help cool our habitat? or warm our habitat, I see trees struggling,, city lawns are at same grade! once man gets an idea it is hard to try to make him rethink his way? never should we shade our land? why mess with perfection?
👍👍
You know it's the north star because you can still see it even if literally everything else in the night sky is blocked out(Moon included)
Wandering Disciple It’s the North Star because it is almost perfectly above true north
Is there any planet orbitting polaris?
At this point in time, a planet has not been detected in this system.
In my country, the Polaris is in the horizon so the brightness of it is fair
⥊ 33: 51!
So 10,000 years ago Polaris would have been in front of the dragon? I wonder if that’s why ancient civilisations have a dragon eating a sun
How best to explain why Polaris follows the path of the Earth around the Sun in all seasons?
It's tilted in the same direction the whole year.
@@eMBO_Gaming I will clarify: Time-lapsed photos show Polaris year-round in one position with all the stars revolving around it. If this is the effect of the Earth's rotation, then Polaris (and all the stars) must be following the Earth around the Sun; otherwise, Polaris would not be seen in the same position as Earth revolves around the Sun throughout the year.
@@Troy-Moses oh so you mean the parallax effect. It's unrecognizable because of the distance to Polaris from the Sun which is 433 light years in comparison to 0.00001581 light year from Earth to the Sun. When you move the same amount of distance the apparent change of the position of some object will be smaller on further distance from you than on closer, so now imagine that taken to this scale. That's why you can only detect parallax of closer stars such as Proxima Centauri or Wolf 359 but still only with relatively strong amateur telescope. That's why the only quick change of the position of such far away stars would be caused by the change in Earth's tilt itself which happens, because it makes a small circle every 26000 years which is called axial precession. That's why Polaris with the whole sky will be getting closer to the north celestial pole until around year 2100, after which it will be getting further away, but its position relative to other stars with barely change, to observe that which is called proper motion you again must look at closer stars such as the ones I mentioned earlier, or for example Barnard Star which has the greatest rate of it on the entire sky.
@@eMBO_Gaming Thank you... I will look further into the Parallax Effect.
@@Troy-Moses np
Scorpius
Polaris,how to see in Asian countries in Bangladesh?
Polaris should be visible in Bangladesh. It’s latitude is 23 degrees, so Polaris should be 23 off the horizon to the North. It is not a particularly bright star, so dark skies help to make it more visible. Good luck!
24 hours of sunlight, our orbit, we see it the shadow on the moon, it counts, , ,
Distance estimates given here are grossly out of date. Most data since the 1990s indicate that the Polaris ternary system is 323-346 light-years from Earth.
Thank you for commenting. I did some researching and found the information you referenced about Polaris being closer than previously estimated as well. Thank you for the update!
The reason the north star looks like it doesn't move is because it doesn't.
It does move,, it's 0.8 degrees off centre.
@@michaelparsons2225 wow really Michael?
I think the North Star will eventually disappear because if its 433 light years away it's part of the space that is expanding faster than the speed of light is this not true
If you live in the Equator then Polaris can set & rise many times than any other star cause it is the North Pole Star
U watchin another star then buddy CAUSE IT DOESNT MOVE!!
@@devinnorsworthy9243 it hardly moves
Devin Norsworthy
You can actually fit a Moon diameter between the north celestial pole and Polaris, which isn't perfectly centered.
Hence, its trail would draw a small circle in 23 hours and 56 minutes.
.. ... .. 👁️
🥺🔭
if the gyration only happens every 26000 years in year 28000 the north star will no longer be the north star?
I believe in year 28,000 Polaris would be the north star again. The pole star changes due to the precession cycle. Gamma Cephei looks to be the next pole star in 4000 CE. See this website for details: earthsky.org/brightest-stars/star-errai-future-north-star ...I like the animations it provides.
What happens when Our poles shift?
☠💀☠💀⚰🪦