Dec. 21 is the official start of winter; however the darkest afternoon comes weeks before on Dec. 7 when the sun will set later, expanding the afternoon brightness by five minutes.
Nighttime is now longer and with the artificial sky glow, the New York City and Los Angeles skies are now 40 times brighter than the natural background.…
In a single second light could travel around the world almost 9 times at a speed of 186,282 miles per second. Satellite’s transmitting time beeps to your…