Page:Gods Glory in the Heavens.djvu/387

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

 

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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