These great hollow globes of artificial super-metals, and artificial transparent adamant, ranged in size from the earliest and smallest structures, which were no bigger than a very small asteroid, to spheres considerably larger than the Earth. (Olaf Stapledon, STAR MAKER)
Monday, October 14, 2013
Analemma
Today's Astronomy Picture of the Day is a "analemma" (a series of pictures taken over the course of the year from the same position) showing how the Sun moves about when it is "exactly overhead".
No comments:
Post a Comment