Categories: Astrophotos

Astrophoto: Polaris and Circumpolar Rotation in 30 Minutes

This recent image from astrophotographer John Chumack shows the Earth’s natural rotation in just 30 minutes of exposure time. Polaris, the North Star, is the stationary point over a Sequoia tree in Warrenton, Virginia, USA. “The rotational speed of the Earth at the equator is about 1,038 miles per hour,” John writes. “At mid-latitudes, the speed of the Earth’s rotation decreases to 700 – 900 miles per hour. You can notice star trails “rotation” in your photographs even in as little as 1 minute exposures. I notice star trailing in about 30 seconds with a 17mm wide angle lens. But the longer you leave the shutter open the more trailing and the more dramatic the effect!”

John used a Canon Rebel Xsi, ISO 400, .17mm Lens at F4.

See more of his work at his website, Galactic Images.

Want to get your astrophoto featured on Universe Today? Join our Flickr group or send us your images by email (this means you’re giving us permission to post them). Please explain what’s in the picture, when you took it, the equipment you used, etc.

Nancy Atkinson

Nancy has been with Universe Today since 2004, and has published over 6,000 articles on space exploration, astronomy, science and technology. She is the author of two books: "Eight Years to the Moon: the History of the Apollo Missions," (2019) which shares the stories of 60 engineers and scientists who worked behind the scenes to make landing on the Moon possible; and "Incredible Stories from Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos" (2016) tells the stories of those who work on NASA's robotic missions to explore the Solar System and beyond. Follow Nancy on Twitter at https://twitter.com/Nancy_A and and Instagram at and https://www.instagram.com/nancyatkinson_ut/

Recent Posts

The United State announces a stop to testing Anti-Satellite Weapons

The United States Government has declared that it will no longer be performing tests of…

3 hours ago

Mystery Rocket Crash Site, ISS Independence, Space Nuclear Power

NASA teases JWST images, Rocket Lab launches CAPSTONE, mystery rocket's crash site found on the…

23 hours ago

The Solar System is Stable for at Least the Next 100,000 Years

It’s nice to have a feel-good story every once in a while, so here’s one…

1 day ago

Most Black Holes Spin Rapidly. This one… Doesn’t

A Chandra X-ray Observatory view of the supermassive black hole at the heart of quasar…

2 days ago

Tidal Heating Could Make Exomoons Much More Habitable (and Detectable)

A new study shows how the study of tidal heating in exomoons could greatly expand…

2 days ago

Red Supergiant Stars Bubble and Froth so Much That Their Position in the Sky Seems to Dance Around

Making a 3D map of our galaxy would be easier if some stars behaved long…

2 days ago