I thought this was pretty interesting (http://www.heavens-above.com/IssHeight.aspx? http://www.heavens-above.com/IssHeight.aspx?) The mean height of the ISS ove

I thought this was pretty interesting (http://www.heavens-above.com/IssHeight.aspx? http://www.heavens-above.com/IssHeight.aspx?) The mean height of the ISS over a two year period. I had no idea that atmospheric drag had that great an effect at a 400km altitude.