The Dark Side of the Moon in Twilight


Crescent Moon with Earthshine Amid Stars

The waxing crescent Moon shines amid the stars and deep blue twilight.

This was the scene last night, as the two-day-old Moon reappeared in the evening sky as a thin crescent.

The Moon looks full because most of the side facing us was brilliantly lit by Earthshine, sunlight reflected off the Earth and lighting the Moon. Here, only the thin crescent at right is directly lit by the Sun.

This was a particularly bright example of Earthshine, likely because so much of the northern part of the Earth is now covered with cloud and snow, making Earth even more reflective than it usually is.

To capture this scene through a telescope, I shot a set of high-dynamic-range exposures, from long to short, to capture the huge range in brightness from the dayside to the darkside of the Moon. The long exposure also captured the stars in the deep blue twilight of a clear New Mexico sky.

– Alan, November 25, 2014 / © 2014 Alan Dyer

The Down Under Waxing Moon


Earthshine on Australian Waning Crescent Moon (HDR)

To northern eyes this looks like an old Moon in the morning sky, but this is really a young Moon in the evening sky – seen from Australia.

This was the waxing crescent Moon a few nights ago in the early evening sky. Because I took this from a latitude of 30° south, the Moon is turned over almost 90° from the way northern hemisphere viewers would see it from Canada or the northern U.S.

For this image, I shot ten exposures from 1/30s to 15 seconds and merged them into one “high dynamic range” composite using Photomatix Pro software. The result is an image with detail in both the bright sunlit crescent and in the dark side of the Moon visible here lit by Earthshine, sunlight reflected off the Earth. The resulting “HDR image” compressed the wide range of brightness into one image, to show the Moon the way your eye would see it but that photo technology is still not capable of recording in one exposure.

– Alan, December 20, 2012 / © 2012 Alan Dyer