Earthshine is the coolest thing

Apr 23

Written by:
4/23/2012 9:29 PM  RssIcon

Okay, I'm not a huge lunar observing fan, though I take my views of craters every so often. And yet there is just something about earthshine I find fascinating.  And then it hit me the other day as I was writing my script for this week's video.  When you see earthshine, you're seeing sunlight that is both immediate, and delayed - simultaneously.  

The sunlight bouncing off the Moon's lit crescent side takes 1.3 seconds to reach your eye (~240,000 miles / 186,000 miles per second = 1.3).  But the dark side of the moon (can't help it - I like Pink Floyd) where the earthshine is seen during early crescent phases, has traveled a slightly longer path.  It's gone the same distance, to Earth, but then it's bounced back to the Moon (from Earth's surface / clouds / etc.), then back again off the dark side to your eye.  So the same sunlight arrives at your eye 2.6 seconds or so later than the "brighter side" light did.

Anyway, when I saw the phenomenon tonight that I'd talked about in this week's video (Eyes on the Sky: April 23 thru April 29) - and it was clear tonight! - I captured some actual video of earthshine and put this together.  I even managed to capture it in some different exposure settings, but of course the very best way to see earthshine?  Your own eye.  It can handle the contrast difference better than just about any camera.  Try spotting it with binoculars or any small telescope.  

It really IS cool to see.


Tags:
Categories:
Location: Blogs Parent Separator The Nightlight

5 comment(s) so far...


louis vuitton outlet online

Until further notice, the items remain banned from the cabins of commercial planes.
# louis vuitton outlet online

By TrackBack on   4/24/2013 10:53 AM

louis vuitton monogram canvas

According to a survey of about 1,800 Americans released Monday, about 73% said they do not want knives in airplane cabins.
# louis vuitton monogram canvas

By TrackBack on   4/24/2013 11:09 AM

Re: Earthshine is the coolest thing

After repeatedly beating the Bulls in pick-and-roll situations in Game 1, Williams didn't make his first and only field goal until the 6:35 mark of the third quarter and finished with eight points and 10 assists while missing eight of nine shots.
# cheap air jorda

By TrackBack on   4/24/2013 11:09 AM

authentic retro jordans

Joakim Noah again battled his way through plantar fasciitis, contributing 11 points and 10 rebounds in 25 minutes and dropping the exclamation point with a driving layup for an eight-point lead with 1 minute, 58 seconds left.
# authentic retro jordans

By TrackBack on   4/24/2013 11:09 AM

cheap jordans

As well much make-up or clothing is a no-no.
# cheap jordans

By TrackBack on   4/26/2013 11:02 AM

Your name:
Gravatar Preview
Your email:
(Optional) Email used only to show Gravatar.
Your website:
Title:
Comment:
Security Code
CAPTCHA image
Enter the code shown above in the box below
Add Comment   Cancel 

The Nightlight

This blog includes what to see in the night and daytime skies, thoughts on telescopes, binoculars, and other astronomy observing accessories and equipment, plus my own occasional notes on objects I've seen and observed. Oh, and the random theater or other "my take on life" post. In other words, there is always something interesting. Check it out.