Register for an account


Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.


Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

The Sciences

Sidereal Motion

Bad AstronomyBy Phil PlaitFebruary 25, 2011 5:56 PM


Sign up for our email newsletter for the latest science news

A few days ago I posted a video by José Francisco Salgado showing the sky over telescopes in Chile. He's just put up another one, this time showing the motion of the sky over several observatories: "Sidereal Motion".

[embed width="610"][/embed]

Sidereal motion is literally the movement of the stars; the apparent rising and setting caused by the rotation of the Earth. You don't notice it second-by-second as you watch the sky, but over minutes and hours the inevitability of our planet's angular momentum makes itself known. José also has breathtaking images of observatories

as well as a website

linking to his work. He has an artist's eye for the heavens, and his creations are truly lovely.

Related posts: - Happy new year again! - Amazing wide-angle time lapse night sky video - Tahoe galaxy - Awesome timelapse video: Rapture

    3 Free Articles Left

    Want it all? Get unlimited access when you subscribe.


    Already a subscriber? Register or Log In

    Want unlimited access?

    Subscribe today and save 70%


    Already a subscriber? Register or Log In