An astronomer is someone who observes the universe and tries to explain what is observed. ... Refraction is also the basis of eyeglasses and some telescopes. ...
Eros. http://near.jhuapl.edu/iod/20010205/index.html. Jupiter ... Ridpath and Tirion, Guide to Stars and Planets, Collins, 1984. Neighbourhood of our Solar System ...
... the moon in a prograde fashion with significant gravitational perturbations by the earth. ... are particularly interesting for mission designers because ...