Our friend Duke Marsh of New Albany, Indiana posted this photo on EarthSky’s Facebook page overnight last night. It’s a masterful image of a nearly first quarter moon in a hazy sky on April 17, 2013. We’ve asked Duke for more details on how he captured this image and will post here when he responds, probably later today.
For now, can you notice that last night’s moon wasn’t quite a first quarter moon? First quarter moon comes today (April 18) at 1231 UTC (7:31 a.m. CDT in the central U.S.). At first quarter, the line between light and dark on the moon is straight. On last night’s moon, the line between light and dark – called the terminator line – was very slightly concave, or sunken inward, toward the lighted portion of the moon.
Also, it’s unusual to see such a widely illuminated moon showing so much light on its darkened portion, or night side. Maybe Duke will tell us later today how he managed to captured so much light on the moon’s night side! For now … enjoy this beautiful image.
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.