“Some crows are perfectly still and have their heads tucked into their breast,” Granger says. “Some crows don’t have their ...

Astronomical twilight is the transition to fully dark skies, when the sun is between 12 and 18 degrees below the horizon. Volcanic activity at Anak Krakatoa ("Child of Krakatoa") in Indonesia.

Look west in late twilight in early February, and you’ll still see Venus and Saturn holding their own. Sad to say, Saturn is slipping away and will soon disappear in the sunset glow. Come mid ...