Page:Gods Glory in the Heavens.djvu/395

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

 

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TELESCOPE.

Lord Rosse's Great Reflector, diameter of mirror, in feet,	6
Lord Rosse's Great Reflector,— — — thickness of mirror, in inches,	5