We are all in the gutter, but some of us are looking at the stars.
Posted 07 March 2014 - 12:54 AM
NASA's Lunar Reconnaissance Orbiter Views Chang'e Lunar Rover Landing Site
Chang'e 3 landed on the moon's Mare Imbrium (Sea of Rains), on Dec. 14, 2013. The LROC instrument aboard NASA's Lunar Reconnaissance Orbiter has now imaged the Chinese lander and rover three times: Dec. 25, 2013 (M1142582775R), Jan. 21, 2014 (M1144936321L), and Feb. 17, 2014 (M1147290066R). From month-to-month the solar incidence angle decreased steadily from 77 degrees to 45 degrees (incidence angle at sunset is 90 degrees); due to the latitude of the site (44.1214 degrees north, 340.4884 degrees east, -2,630 meters elevation) the incidence angle cannot get much smaller. Solar incidence angle is a measure of the sun above the horizon; at noon on the equator the sun is overhead and the incidence angle is zero degrees, at dawn or dusk the incidence angle is 90 degrees.
"Space is big. Really big. You just won't believe how vastly, hugely, mind-boggingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space." - The Hitch-Hikers Guide to the Galaxy - Douglas Adams 1952 - 2001