Epicycles, a. [140], [145]

Epochs, a. [46].

Equant, a. [175].

Equation of time, a. [159].

Equator, a. [130].

Equinoctial points, a. [131].

Escarpment, b. [537].

Evection, a. [171], [172].

Exchanges of heat, Theory of, b. [143].

Facts and ideas, a. [43].