Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 237
Diag. LXXXIX. Goodricke, who discovered the law of change in thebrightness of Algol, suggested that the star possessesa dark companion, which periodically intervenes be-tween Algol and the Earth and cuts off a part of thelight. Diagrams LXXXIX and XC illustrate exactlyhow this occurs. In Diagram…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
