sunrise

Why Does the Sun Rise in the East (and Set in the West)?

Since time immemorial, humans have known that the Sun will rise in the east and set in the west. But…

4 years ago

Earth’s Highest Clouds Shine at the “Top of the Orbit”

Looking for a new desktop background? This might do nicely: a photo of noctilucent "night-shining"¬†clouds seen above a midnight Sun…

7 years ago

Terminator

[/caption] No, this isn't a movie about robots. The terminator is the line that separates day from night on an…

10 years ago