History of Astronomy: Figures

This is just a collection of figures that were used in the history of astronomy notes.

Explanation of apparent retrograde motion in the heliocentric model.

Visualization of the altitude-azimuth coordinate system sometimes used in observational astronomy.

Visualization of an ellipse, showing the semi-major axis, semi-minor axis, foci, and eccentricity.

A visualization of stellar parallax, the apparent shift in position of nearby stars against the background of distant stars as Earth orbits the Sun.