n,and F its position at the Last Quarter. Draw the chord L F,and compute m n the versed sine of the arc 7° 15. The mean radius of the earths orbit is 397 times the ra-dius of the lunar orbit. A radius of 397 and an angle 7° 15gives a versed sine of 3.49; but on this scale the distancefrom the earth… … 134 ASTRONOMY. Chap. xi. other year, when it comes to the meridian, near midnight, it is then most conspicuous; and the next year it is scarcely noticed by the common observer. ■ The physical appearance ofTelescopic View of Mars. tvt • u , i_ ui tr- Mars is somewhat remarkable. His polar regions,…
Astronomy
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