Part 46

Kepler's system, 44. laws, 46. star, 362.

Kirchhoff's map of spectrum, 164.

Laplace's hypothesis, 392.

Latitude, celestial, 30.

Leap year, 81.

Leo, or the Lion, 334.

Leonids (meteors), 312.

Libra, or the Balances, 347.

Libration, 102.

Longitude, celestial, 30.

Lyra, or the Lyre, 338. double star in, 356.

Magellanic clouds, the, 389.

Magnetic storms, 190.

Magnetism and sun-spots, 190.

Mars, apparent size of, 236. brilliancy of, 237. distance of, 235. orbit of, 235. periods of, 237. rotation of, 239. satellites of, 239. volume of, 236.

Mercury, apparent size of, 226. atmosphere of, 228. distance of, 225. elongation of, 227. orbit of, 225. periods of, 227. volume of, 226.

Meridian, the, 12.

Meridian circle, 17.

Meridians, celestial, 31.

Meteoric iron, 305, 307. showers, 310. stones, 305.

Meteors, 300. August, 311. light of, 309. November, 312. sporadic, 310.

Meteoroids, 308.

Micrometers, 20, 153.

Milky-Way, the, 326.

Mimas, moon of Saturn, 259.

Mira, a variable star, 359.

Moon, apparent size of, 87, 89. aspects of, 91. atmosphere of, 109. chasms in, 123. craters in, 119. day of, 108. distance of, 86. eclipses of, 210. form of orbit, 97. harvest, 101. hunter's, 102. inclination of orbit, 97. kept in her path by gravity, 51. librations of, 102. mass of, 90. meridian altitude of, 98. mountains of, 116. orbital motion of, 91. phases of, 93. real size of, 88. rising of, 99. rotation of, 102. sidereal period of, 92. surface of, 115. synodical period of, 92. terminator of, 115. wet and dry, 98.

Nadir, the, 6.