Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 101
ecedefrom it. Furthermore, we see in Fig. 2 that the greater thedeclination of the sun, the smaller is the apparent diurnal circlein which it moves, and the greater will be the length of timerequired for the sun to reach the depression of 18° below thehorizon. The shortest twilight, therefore,… … APPEARANCE OF THE SUN. 95 North Pole, wintered at latitude 78° 18 N., so ^av above the circleab, Fig. 40, that the sun was continually below the horizon fromthe middle of October to the middle of February, but at the be-ginning and the end of this interval twilight lasted for aboutnine hours. At…
Astronomy
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