The young astronomer; or, The facts developed by modern astronomy, collected for the use of schools and the general reader (1847)
Abbott, John S. C. (John Stevens Cabot), 1805-1877 · New York, J.C. Riker [etc.] · leaf 45
, that which is best suited for thisspecies of observation is the Moon. And hence, thismethod of determining the longitude at sea has beendistinguished by the appellation of the lunar method.The mariner, with the sextant, observes the distanceof the Moon from the Sun. The Nautical Almanacinforms… … A Moon, or satellite, is aplanetary body which revolvesaround a primary planet as itscentre. It is sometimes calleda secondary planet. In an or-bit, distant about two hundredand forty thousand miles fromthe Earth, our Moon revolves. Telescopic View of the Moon. Though the Moon is the nearest to us…
Astronomy
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