tannyan, early notice of chromosphere, 68

Star catalogues, 28, 31, 32, 60, 414, 415;
spectroscopic, 381, 385, 386;
photographic, 412-414;
photometric, 420, 421

Star-drift, 426

Star-gauging, 13, 19, 47

Star-maps, 77, 78, 81, 284, 413, 415;
photographic, 413, 414

Stars, movements, 9, 10, 35, 39, 415, 426;
radial, 386, 387, 406;
comparative brightness, 13, 49, 50, 420, 421;
distances, 35-37, 416-418;
chemistry, 372, 381, 382;
spectroscopic orders, 373;
colours, 374;
development, 375-377;
actual magnitudes, 422;
gregarious, 426

Stars, double, physical connection surmised, 17;
proved, 18, 442;
masses, 38, 42;
catalogues, 43, 45, 47, 50, 418, 419;
orbits, 46, 418;
discoveries, 43, 46, 47, 418, 419, 435;
photographs, 409;
evolution, 420

Stars, gaseous, 377-380

Stars, temporary, 24, 392-401

Stars, variable, early discoveries, 9;
Eta Carinae, 48, 49, 379;
sun-spot analogy, 128, 392;
spectra, 379;
Algol class, 390, 391;
catalogues, 391, 392

Stefan, law of cooling, 219

Steinheil, stellar photometry, 420;
silvered glass reflectors, 429

Stewart, Balfour, Kirchhoff's principle, 135 _note_;
solar investigations, 154, 155

Stewart, Matthew, solar distance by lunar theory, 230

Stokes, prevision of spectrum analysis, 138

Stone, E. J., reversal of Fraunhofer spectrum, 172;
distance of the sun, 231, 232, 236;
transit of Venus, 240;
Cape catalogue, 415;
proper motions, 426

Stone, O., star catalogues, 415;
measures of double stars, 419

Stoney, carbon in photosphere, 152;
dynamical theory of planetary atmospheres, 288;
perturbations of Leonids, 338;
status of red stars, 375

Stratonoff, star counts in Pleiades, 411

Stroobant, satellite of Venus, 256

Struve, F. G. W., stellar parallax, 35;
career and investigations, 43-45;
occultation by Halley's comet, 106;
Russo-Scandinavian arc, 261, 262

Struve, Ludwig, solar translation, 40

Struve, Otto, parallax of Eta Cassiopeiae, 38;
solar velocity, 40;
his father's successor at Pulkowa, 45;
eclipse of 1842, 62, 64;
Neptune's satellite, 84;
research on Saturn's rings, 300, 301;
variable nebula, 403

Stumpe, solar translation, 40

Sun, Herschel's theory, 54-57, 70, 149;
atmospheric circulation, 58, 59;