A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 74
supon their surfaces, by the aid of tele-scopes. 1. In the cut we have an arc of the earths orbit, and theearth revolving on her axis as she revolves around the sun.The arrows show the direction in both cases. 2. By holding the book up south of him, and looking at-tentively at the cut, the student… … /; TIME. 131. Time is duration measured either by natural orartificial means. The principal natural indicators of thelapse of duration are the revolution of the earth upon itsaxis, marking a natural day ; the change of the moon,denoting a lunar month; and the cycle of the seasons,denoting a year.…
Astronomy
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