Lacaile, N.L., 139 Lagrange, J.L., 61, 62, 65, 119 La Hire, 114 Lalande, J.J.L., 60, 63, 65, 66, 72, 139 Lamont, J., 98 Langrenus, 107 Laplace, P.S. de, 50, 58, 61, 62, 65,66, 123, 146 Lassel, 72, 88, 117, 118 Law of universal gravitation, 53 Legendre, 65 Leonardo da Vinci, 46 Lewis, G.C., 17 Le Verrier, U.J.J., 65, 68, 70, 71,72, 110, 118, 125 Lexell, 66, 123 Light year, 128 Lipperhey, H., 86 Littrow, 121 Lockyer, J.N., 103, 105, 146 Logarithms invented, 50 Loewy, 2, 100 Long inequality of Jupiter and Saturn, 50, 62 Lowell, P., 111, 112, 118 Lubienietz, S. de, 122 Luther, M., 38 Lunar theory, 37, 50, 56, 64 Maclaurin, 65 Maclear, T., 128 Malvasia, 77 Martin, 9 Maxwell, J. Clerk, 117 Maskelyne, N., 80, 130 McLean, F., 89 Medici, Cosmo di, 48 Melancthon, 38 Melotte, 83, 116 Meteors, 123 Meton, 15 Meyer, 57, 65 Michaelson, 85 Miraldi, 110, 114 Molyneux, 87 Moon, physical observations, 107 Mouchez, 139 Moyriac de Mailla, 8 Napier, Lord, 50 Nasmyth and Carpenter, 108 Nebulae, 141, 146 Neison, E., 108 Neptune, discovery of, 68-72 Newall, 89 Newcomb, 85 Newton, H.A., 124 Newton, I., 5, 19, 43, 49, 51-60, 62, 64, 68, 77, 79, 87, 90, 93, 94, 114, 127, 133 Nicetas, 16, 25 Niesten, 115 Nunez, P., 35 Olbers, H.W.M., 67 Omar, 11, 24 Oppolzer, 13, 125 Oudemans, 129 Palitsch, G., 64 Parallax, solar, 85, 86 Parmenides, 14 Paul III., 30 Paul V., 48 Pemberton, 51 Peters, C.A.F., 125, 128, 135 Photography, 99 Piazzi, G., 67, 128, 129, 139 Picard, 54, 77, 114 Pickering, E.C., 118, 135 Pingré, 13, 122 Plana, 65 Planets and satellites, physical observations, 109-119 Plato, 17, 23, 26, 40 Poisson, 65 Pond, J., 80 Pons, 122 Porta, B., 86 Pound, 87, 114 Pontecoulant, 64 Precession of the equinoxes, 19-21, 55, 57 Proctor, R.A., 111 Pritchett, 115 Ptolemy, 11, 13, 21, 22, 23, 24, 93 Puiseux and Loewy, 108 Pulfrich, 131 Purbach, G., 24 Pythagoras, 14, 17, 25, 29 Ramsay, W., 106 Ransome and May, 81 Reflecting telescopes invented, 87 Regiomontanus (Müller), 24 Respighi, 82 Retrograde motion of planets, 22 Riccioli, 107 Roberts, 137 Römer, O.,78, 114 Rosse, Earl of, 88, 142 Rowland, H. A., 92, 102 Rudolph H.,37, 39 Rumker, C., 139 Sabine, E., 98 Savary, 133 Schaeberle, J. M., 135 Schiaparelli, G. V., 110, 111, 124, 125 Scheiner, C., 87, 95, 96 Schmidt, 108 Schott, 88 Schröter, J. H., 107, 110, 111, 124, 125 Schuster, 98 Schwabe, G. H., 97 Secchi, A., 93, 144 Short, 87 Simms, J., 81 Slipher, V. M., 119 Socrates, 17 Solon, 15 Souciet, 8 South, J., 133 Spectroscope, 89-92 Spectroheliograph, 101 Spoerer, G. F. W., 98 Spots on the sun, 84; periodicity of, 97 Stars, Parallax, 127; proper motion, 129; double, 132; binaries, 132, 135; new, 19, 36, 137; catalogues of, 19, 36, 139; spectra of, 143 Stewart, B., 2, 100 Stokes, G. G., 91 Stone, E. J., 139 Struve, C. L., 130 Struve, F. G. W,, 88, 115, 128, 133