Sun's Rays and Temperature Zones during the Solstices, 1901
A chart from 1901 showing the effect of the sun's rays on the torrid and frigid temperature zones during the annual solstices. "The sun's rays are always perpendicular somewhere between the tropics, and that part of the earth's surface is quite ...

Solar System, 1920
A chart of the solar system from 1920. This chart only extends to the planet Neptune (discovered as a planet of the solar system in 1846), and shows the period of revolution around the sun for each of the planets, the asteroid belt, and the paths of ...

Comparative Sizes of the Planets, 1920
Comparative sizes of the planets....

Apparent Path of the Sun, 1920
The apparent path of the sun throughout the year....

Solar System, 1920
A chart of the solar system from 1920. This chart extends to the planet Neptune (discovered as a planet of the solar system in 1846), and shows the period of revolution around the sun for each of the planets, the path of the asteroids (asteroid belt)...

Comparative Sizes of the Planets, 1920
Map shows planets' size in relation to the Sun and each other. ...