The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 145
appulse. When thecentre of the moon coincides with the line which connects thecentre of the earth and that of the sun, the eclipse is cen-tral. A central eclipse occurs very rarely, if indeed it occursat all. 152. The Semi-Angle of the Umbral Cone.—The semi-angle ofthe umbral cone is the angle EA… … 153. The Angular Semi-Diameter of the Shadow at the Distanceof the Moon.—The angular semi-diameter of the shadow at thedistance of the moon is the angle MEM. We have, by Geometry, EM G = MEM + EA G.Now EM G is the moons horizontal parallax, which we willrepresent by P, and the value of EAG has been…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
