n of latitude, 258

Kunowsky, spots on Mars, 275

Lacaille, southern nebulae, 22;
Eta Carinae, 48

Lagrange, theory of solar system, 2;
planetary disruption, 76

Lahire, diffraction theory of corona, 67;
distance of the sun, 228;
mountains of Venus, 252

Lalande, popularisation of astronomy, 5;
revolving stars, 18;
_Histoire Celeste_, 31, 415;
nature of sun-spots, 53;
observations of Neptune, 83

Lambert, solar motion, 10;
construction of the universe, 14, 40;
missing planets, 71

Lamont, magnetic period, 127, 128

Lamp, ashen light on Venus, 256

Langdon, mountains of Venus, 253

Langley, solar granules, 165;
corona of 1878, 176;
spectroscopic effects of solar rotation, 202;
infra-red spectrum, 210, 223, 224;
experiments at Pittsburg, 221;
bolometer, 222;
distribution of energy in spectrum, 224, 225;
atmospheric absorption, 224, 225, 276;
solar constant, 225;
lunar heat-spectrum, 269;
temperature of lunar surface, 270;
age of the sun, 312

Laplace, lunar acceleration, 2, 271;
_Systeme du Monde_, 5;
nebular hypothesis, 25, 308, 309, 313, 314, 322;
stability of Saturn's rings, 85, 298;
solar atmosphere, 94, 221;
Lexell's comet, 106, 367;
solar distance by lunar theory, 230;
origin of meteors, 328;
of comets, 370

Lassell, discovery of Neptune's satellite, 83;
of Hyperion, 85;
Saturn's dusky ring, 86;
observations at Malta, 87, 434;
reflectors, 114;
equatoreal mounting, 121

Latitude, variation of, 258, 259

Laugier, period of 1843 comet, 105;
solar rotation, 146

Le Chatelier, temperature of the sun, 219

Lescarbault, pseudo-discovery of Vulcan, 248;
halo round Venus, 254

Lespiault, orbits of minor planets, 285

Le Sueur, spectrum of Jupiter, 291

Leverrier, discovery of Neptune, 80-82;
Lexell's comet, 98, 367;
distance of the sun, 230, 240;
revolutions of Mercury, 248;
supposed transits of Vulcan, 249;
mass of asteroids, 287;
orbit of November meteors, 332;
Perseids and Leonids, 333

Lexell, comet of 1770, 98, 106, 367

Liais, supposed transit of Vulcan, 249;
comet of 1861, 326;
division of a comet, 339

Librations, of Mercury, 247;
of Venus, 251;
of the moon, 266

Lick, foundation of observatory, 434

Light, velocity, 38, 232, 241