Venus and the Moon Tonight, April 21, 2015


DSC02515

Brilliant Venus is joined by the crescent moon this evening in the western sky.  In the image above, the moon is overexposed in this 10-second exposure.  Tonight the moon is 4 degrees to the upper left of the star Aldebaran and nearly 8 degrees from Venus.

DSC02518

In this close-up view of the same scene in a two-second exposure, the moon’s crescent is distinct along with a soft glow from the lunar night portion.  This effect is known as “earthshine.”  Sunlight reflected from Earth, which is just past the full phase as seen from the moon, gently illuminates the night portion of the moon, similar to the manner in which a full moon illuminates the terrestrial landscape.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: