Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 79
the standard of time? Why is this division of time adopted as a standard?What is said of weeks, months, and years? Hours, minutes, and seconds? What ismeant by the term sidereal day ? What by solar day ? Which is the longest ? Whatis now to he explained ? What three things must we bear in mind ? OF… … SOLAR AND SIDEREAL DAY. (B), the autumnal equinox, (C), and the winter solstice1,(D). Here, in the first place, the earth is seen, as shown I. The vernal equinox occurs on the 20th of March; the summer sol-stice on the 21st of June; the autumnal equinox, on the 23d of Sep-tember ; and the winter…
Astronomy
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