I was struggling for near a week to understand some concepts regarding the trajectory of the sun as viewed from different latitudes on Earth. Thanks to you, now everything is crystal clear!!
THANK YOU SOOO MUCH!! I have been struggling so badly with perception and the appearance of movement of the stars. This was the best lesson I have seen thus far.
Hi, I'm a software developer who is currently dealing with calculation of sunrise/sunset. I wanted to learn more about the subject but didn't find much quality materials Yours is just great! I'm now more interested in Astronomy than ever.
This was really good. I'm in Sydney, so I was really glad you did some Southern Hemisphere examples too. An excellent, well-paced, very clear intro to the Celestial Sphere. Thank you!
Fantastic explanation. Though i had work similar dynamics still had lot to learn. Also the associated animation link is fascinating to play with. Thanks for sharing.
Ahh hello sir, I really want to thank you for your videos, they are very informative and I learned more than what my professors taught. I am very happy I found your channel. Keep up the good work sir
Very well explained; though it's probably not my level yet and I don't need to go into that much detail, I could still understand the length of the lecture that I watched fairly well. Thank you
Watching this raised some questions in my mind. First, Polaris is what we call the star closest to the north pole of Earth's rotation, but what do we call whatever star is closest to the north pole of the ecliptic. I can probably look that up... Secondly, is Polaris visible from the equator? My first inclination is to doubt it, since Polaris seems to be a point object, and the curvature of the Earth should block any cone of visibility at the Equator. Following that assumption, I wonder 1) at what latitude closest to the equator should Polaris be visible? and 2) at what lowest altitude above the Equator should Polaris be visible. But, I remember that Polaris is a star, and, like our Sun, should be many times larger than the Earth, so actually the Equator should be the "top" of a frustum of a cone, with an orthogonal great circle around Polaris forming the base, so that Polaris should be visible at the Equator. I realize that the distance involved is so great that we can treat light coming from Polaris as being parallel, and so Polaris ought to be visible on the horizon at the Equator. Thanks for the video.
Thanks for the video. I would like to have a better understanding of the the precession of the equinox. Would you happen to have a video that show this concept.
We want to use this video for a college course in Astronomy at Santa Rosa Junior College. Would you please grant us permission to caption the video so it has punctuation and clear sentences? If you turn on Community Contributions in RU-vid, we could add the better captions to these videos. Alternatively, we can send you a corrected caption file that you can upload in RU-vid. One more option is to use a site such as Amara.org that will embed the video and give us an interface to overlay the video with the better caption file. All of these options leave the control in your hands. If you take down the video, it will no longer appear in the course, we will just be embedding from RU-vid, not downloading the video.
actually I don't live in the northern hemisphere..specifically not Westchester ny.. Im one of those strange people that like to live upside down in Australia