Guy's Elements of astronomy : and an abridgment of Keith's New treastise on the use of the globes (1864)
Guy, Joseph, 1784-1867, Keith, Thomas, 1759-1824. A new treatise on the use of the globes · Philadelphia, C. Desilver · leaf 124
J^r p<^t. ffeh^rrritTir r/7/i/ Oeore^rhfj- Lrifte/rturff … UMBRA AND PEjVUMBRA, IN ECLIPSES. 83 penumbra, P U the line described by the centres ofthe moons umbra and penumbra at the earth; N themoons node; E the earths centre; ^^ n the moonspenumbra; u the umbra. Then in the first position,the penumbra p n just passes by the earth, without fall-ing upon…
Astronomy
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