A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 175
al periods of time. These arcs of right ascension,it will be apparent, are not equal; for A 5, which is oblique toA B, must subtend a smaller arc, A B, than d e which is nearlyparallel to its arc D E. Thus the arcs of right ascension are short-est at the equinoxes, and longest at the solstices;… … 277. What is a mean solar day ? A civil day ? TIME. 173 the lower meridian, that is, at midnight. Because usedfor the general purposes of civil and social life, it is alsocalled the civil day. Clocks are regulated to show itsbeginning and end, and the equal division of it intohours, minutes, and…
Astronomy
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