John D. Clark
Measure Solar System Objects and Their Movements for Yourself!
Softcover
Clark explains how to calculate the duration of a year on Venus, the size of the Moon, the shape of Io’s orbit, the length of a Martian day and much else using nothing but astrophotographs and simple math. SC. 190pp. 2009.
Mem. Ed. $27.99
Pub. Ed. $34.95
You pay $3.98
