Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 83
ard of timel Why is this division of time adopted as a standard 1What is said of weeks, months, and years? Hours, minutes, and seconds? Wlat ismeant by the term sidereal day ? What by solar day ? Which is the longest ? Whatiiiow *.o be explained ? What three things must we bear in mind ? OF THE… … 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 1. 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♦ember ; and the winter…
Astronomy
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