Page:Gods Glory in the Heavens.djvu/395

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SYNOPTICAL TABLES.
359
Probable average distance of stars of 6th magnitude, 120
Nebulæ, proportion of sphere containing one-third of whole mass, near north pole of the galaxy, 1-8th
Largest proper motion, 1830, Groombridge, 7″
Diameter of the Sun removed to a distance corresponding to one-second parallax, 0″.0093
Light of Sirius (Sun's = 1 at the same distance), 63
Light of the Sun (Sirius = 1) at the Earth, 20,000,000,000
Variable star Algole, period, 2d 20h 48m
Variable star Algole,— — — variation in magnitude, 2.4
Variable star— — — δ Cephei, period, 5d 8h 47m
Variable star δ Cephei,— — — variation in magnitude, 3.5
Variable star— — — β Lyræ., period, 12d 23h 53m
Variable star, β Lyræ.— — — variation in magnitude, 3.4
Number of variable stars, with assigned periods, about 6O
Double stars, odds against one chance combination of 4″ closeness, 9570 to 1
Double stars,— — — number of such combinations, upwards of 100
Sun's distance from Alcyone, the centre of the stellar system (Mædlar), (radius of Earth's orbit = 1), 34,000,000
Sun's— — — time of revolution round Alcyone, in years, 19,256,000
Sun's— — — velocity in space (Earth's annual motion = 1), 1.4
Sun, point in Hercules, to which it is moving,
Sun, point in Hercules, north declination,— — — 34° 37′
Sun, point in Hercules, right ascension,— — — 259°'90
TELESCOPE.
Lord Rosse's Great Reflector, diameter of mirror, in feet, 6
Lord Rosse's Great Reflector,— — — thickness of mirror, in inches, 5
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