Page:Gods Glory in the Heavens.djvu/387

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SYNOPTICAL TABLES.
351
URANUS SATELLITES.
No. Name. Sidereal
Revolution. 		Mean
Apparent
Distance. 		Discoverer, Year of
Discovery.
    d. h. m. s. ″    
1 Ariel 2 12 29 21 13.54 Lassell 1851
2 Umbriel 4 3 28 8 19.28 Lassell 1851
3 Titania 8 16 56 31 31.44 Herschel 1787
4 Oberon 13 11 7 13 42.87 Herschel 1787
Additional satellites seen by Herschel, but not re-observed, 4
Direction of movement of satellites retrograde
Inclination of the orbits of Titania and Oberon to ecliptic, 78° 58′
Distance from the planet -when satellites become invisible (Herschel), 14″
IMagnifying power required for sustained view, 300
NEPTUNE.
Volume (Earth's = 1), 76.6
Mass (Earth's = 1), . 18.900
Density (Earth's = 1), .321
Diameter (Earth's = 1), 4.246
Diameter— — — in miles, 33,610
Diameter— — —apparent, mean, 2.″4
Gravity (Earth = 1), 1.36
Gravity— — — bodies fall in one second, in feet, 21.8
Light and heat from Sun, perihelion, .0011
Light and heat from Sun— — —, aphelion, .0011
Year in which Adams computed its place within 2 degrees, 1845
Year in which Leverrier computed its place, 1846
First observed by M. Galle, from Leverrier's indications, 23d Sept., 1846
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