| View Cart ⇗ | Info

“Suppose the Earth to be in her Summer solstice, which takes place on the 21st of June. At this period she will be at a, having her north pole, n, so inclined towards the Sun, that the whole arctic circle will be illuminated, and consequently the Sun’s rays will extend 23.25 degrees, the breadth of the polar circle, beyond the north pole.” —Comstock, 1850


J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 309


TIFF (full resolution)

2400×1415, 521.3 KiB

Large GIF

1024×603, 63.8 KiB

Medium GIF

640×377, 31.0 KiB

Small GIF

320×188, 10.6 KiB