An arcsecond is a very small angle on the sky; the full moon is more than two million square arcseconds in area.) A decently dark site in a rural area has a sky background of about 21 mag/arcsec 2.

A truly dark night sky is getting harder and harder to find. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

Night Sky’s interface is visually impressive upon initially opening the app and constellations can be viewed in multiple ways. (Image credit: Lloyd Coombes) $5.99 per month, $39.99 per year ...

The prototype BlueWalker 3 satellite is now one of the brightest objects in the night sky. Astronomers are worried about even bigger, brighter satellites that are on the way.

What To Watch For In The Night Sky This Week: August 29-September 4, 2022 This is a great week to watch the crescent Moon climb higher into the western sky during twilight. With each passing night ...

To determine the background brightness of the night sky, Kyba et al. asked participants worldwide to compare star maps of the night sky at different levels of light pollution to what they could ...