Sidereal Motion

Bad Astronomy
The entire universe in blog form
Feb. 25 2011 6:56 AM

Sidereal Motion

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".

Phil Plait Phil Plait

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  

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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.



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