The Sun in Calcium Light

James Ferguson, Astronomy explained upon Sir Isaac Newton's Principles (1757).

The Ptolemaic system, from ‘Margarita Philosophica’, 1535.

Show Girls Get Sun Ray Treatment for ‘Dusky Maiden’ Roles.

Plate II, ‘Radiation and Absorption Spectra, 1878.

Plate IX: Saturn in 1874. From a drawing by L. Trouvelot.

Enlarged photograph of the Sun's disc, original taken 10th May 1878.

Large eruptive prominence, John Evershed, Srinagar, Kashmir, 1916.

Group of Spots on the Sun, dated ' September 13, 1880'

Lithographic colour print issued by Harvard College Observatory in 1876, showing the solar photosphere, the visible surface of the Sun.

The Sun during the partial phase of the 1860 solar eclipse viewed from Northern Spain.

Kepler's model of the universe, 1619.