 'Binary' |
 'Black Holes' |
 'Heart of the Crab' |
 'Multiverse' |
 'Newton's Rings' |
 'Red Shift' |
 'Starseeker' |
 'Sunspots 1' |
 'Transit of Venus' |
To an observer on earth Celestial events occur within the Context of cycles determined by the motions of Earth, Sun and Moon. These cycles provide us with some of our basic Units for measuring time, such as days and years. |
Original works, images and content © 2007 - 2015 Marion Wilner. All rights reserved.