Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 67
eridian. This intervalis called a sidereal day, and is divided into 24 siderealhours, and these again into minutes and seconds. Aclock which marks sidereal time, L e. which goesuniformly at such a rate as always to show Oh. Om. Os.when the equinox comes on the meridian, is called a 60 A TREATISE ON… … earth, NCS its axis ; then are N and S its poles ; EQits equator; AB the parallel of latitude of the stationA on its surface ; AP parallel to SCN, the directionin which an observer at A will see the elevated pole ofthe heavens; and A Z, the prolongation of the terrestrialradius C A, that of his…
Astronomy
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