Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 232
we join and prolong AC, BP; sinceA B is greater than C D, these lines will meet in a point * Let V and v be the mean angular velocities, x the superfluous arc; then Xiv;: 1 + x:x;andV— v; v:: 1: xt whence x is found, and - — the time of* . vdescribing xt or the difference of the sidereal and… … a cone, since C D and A B are spheres), there will hea total shadow. This shadow is called the umbra, anda spectator situated within it can see no part of the sunsdisc. Beyond the umbra are two diverging spaces (orrather, a portion of a single conical space, having K forits vertex), where if a…
Astronomy
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