List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 80
oins the centre of thesun and the observer, the eclipse will be partial. The profound night which accompanies a totalsolar eclipse, lasts under the most favourable cir-cumstances about seven minutes and a half. Theshortness of this period overthrows the conjecture,that the darkness, mentioned in… … 76 OUTLINES OF ASTRONOMY. In the foregoing figure a total eclipse of themoon is represented, s is the sun, e e the earth,m m the orbit of the moon, e e t is the conicalshadow cast by the earth, and the black spot is theeclipsed moon. The moons diameter is divided into twelve parts,called digits;…
Astronomy
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