Range of the tides, 230.

Reckoning, astronomical and chronologi-

cal, the difference between, 202.
Red flames in eclipses of the Sun, 17, 178.
Red stars, catalogue of, 583.
Reflecting circle, 679.
Reflecting telescope, 604.
Reflex zenith-tube, 680.

Reformation of the Calendar by Julius
Cæsar, 425; by pope Gregory XIII, 426.
Refracting telescope, 613.

Refraction, 249, 449, 668; table of, 780.
Repeating circle, 679.

Resisting medium, 273.

Reticulus Rhomboidalis, 559.

Rhea, 143, 144, 145.

Right ascension, 450.

Rings of Saturn, 127.
Roman year, 440.

Rotation of the Sun, 8; of the planets,
40. See also the several planets.

493-

Spectroscope, 682.

Spectrum analysis, 27.

Spherical form of the Earth, proofs of, 67.
Spiral nebulæ, 515.
Spots on the Sun, 5.
Stands for telescopes, 627.
Star-Finder, 648.

Stars, double, 477; binary, 479; coloured,
482; multiple, 483; variable, 485;
catalogue of variable, 576; temporary,
490; general catalogues of, 593; shoot-
ing, 759.

Stellar parallax, 245, 465.

Stones, meteoric, 746. See Aërolites.
Styles, old and new, 428.
Suggestions for observing annular eclipses
of the Sun, 208; for carrying on general
astronomical observations, 700.

Summary of facts concerning the planets,
30; concerning the calculated comets,
346.

Sun, 1, 706; central, speculations on, 494.
Sunday, 436.

Sunday Letter, 456.
Sun-dial, 447.

Sunrise and sunset, 449.

Superior planets, motions of, 29.
Surfaces of the Sun and planets, 39.
Sylvia, 96.

Synodical revolutions of the planets, 38; of
the lunar nodes, 166.

Systems of the universe, 43.

Tables, of the major planets, 38; of re-
fraction, 780; of equation of time, 422;
of differences of style, 431; for the con-
version of time, 770.