Northern and southern star trailsDec 3, 2012
A still from Cantu's video showing northern and southern star trails
Celestial navigators know that sight reductions of star and moon and planet sights have some different corrections depending on whether they are taken from the Northern or Southern Hemisphere. And the apparent motion of the bodies is different too. In the Northern Hemisphere stars appear to move counterclockwise around the North Pole. In the Southern Hemisphere stars appear to move counterclockwise around the South Pole.
Now Mexican amateur astonomer and astrophotographer Cesar Cantu has created a video that shows the motion of the earth from both the northern and southern hemispheres at once. The video combines footage from a site in Mexico and a site in South Africa. Cantu has superimposed the clockwise motion and counterclockwise apparent motions of the stars in the night sky. Check out the video below.