This beautiful time-lapse video was taken from the world's highest revolving restaurant atop a mountain in the Swiss Alps. It shows the stately procession of stars as they move through the night sky. So why are some stars not moving?
The September equinox occurred this morning at 5:05 am EDT, marking the official start of Fall for those of us in the Northern Hemisphere. Twice a year, during the latter halves of March and September, every person on Earth experiences the effects of an equinox in the form of a 12-hour day followed by a 12-hour night.