The International Space Station 10:39 p.m. on Sunday 24th April 2011

I had watched the earlier 9:04 p.m. crossing of the ISS and this lasted nearly 5-minutes at almost the same elevation as the 10:39 p.m. crossing.  So why was the 9:04 p.m. crossing 5-minutes long and the 10:39 p.m. crossing only 3-minutes long?  The accompanying image tells the story.  At 10:39 p.m. the Sun has set further, so the ISS is illuminated for less of its course across the sky.  As you can see in the image – it barely makes Ursa Major before its lights out – fascinating!

  • Print
  • Digg
  • StumbleUpon
  • Facebook
  • Yahoo! Buzz
  • Twitter
  • Google Bookmarks
  • LinkedIn
  • Live
  • Reddit
  • Tumblr

Leave a Reply

Your email address will not be published. Required fields are marked *