An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 170
, at the time of its ECLIPSES. 145 opposition, sometimes nearer to the earth, and sometimes furtherfrom it, will accordingly traverse it at points where its breadthvaries more or less. 247. The semi-angle of the cone of the eartKs shadow, is equalto the suns apparent semi-diameter, minus his… … of which AES is the suns semi-diameter and EAB his horizontalparallax ; and as both these quantities are known, hence the angleat the vertex of the shadow becomes known. Putting (5 for thethe suns semi-diameter, andp for his horizontal parallax, we havethe semi-angle of the earths shadow ECB=5—j9.…
Astronomy
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
