Page:The Moon (Pickering).djvu/145

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LUNAR CONSTANTS

Synodical revolution, or interval from new moon to new moon. Sy nodical rotation, or interval from sunrise to sunrise on the same formation 29d.5305887
(29d 12h 44m 2.s684)
Sidereal revolution, or interval in passing from one star to the same star again 27d.3216614
(27d 7h 43m 11.s545)
Tropical revolution, or interval in passing from the vernal equinox to the same point again 27.d321582
(27d 7h 43m 4.s68)
Anomalistic revolution, or interval in passing from perigee to perigee 27.d55460
(27d 13h 18m 37.s44)
Nodical revolution, or interval in passing from the ascending node to the ascending node again 27.d21222
(27d 5h 5m 35.s81)
Eccentricity of Orbit 0.05490807
Inclination of Orbit to Ecliptic 5° 8′ 40″
Inclination of Equator to Ecliptic 1° 32′ 9″
Maximum geocentric libration in longitude 7° 45′
Maximum geocentric libration in latitude 6° 44′
Maximum geocentric libration 10° 16′
Maximum diurnal libration 1° 1′ 28.″8
Maximum physical libration 3.′0
Surface of the Moon visible at one time or another 0.59
Surface of the Moon never visible 0.41
Distance, maximum 252,972 miles (407,116 km.)
Distance, minimum 221,614 miles (356,650 km.)
Distance, mean 238,840 miles (384,372 km.)
Diameter, maximum 33′ 33″-20
Diameter, minimum 29′ 23″-65
Diameter, mean 31′ 08″
Diameter, linear 2,163 miles (3,481 km.)
Mass 0.01228 or (illegible text) of the Earth
Surface 0.07448 or (illegible text) of the Earth
Volume 0.02033 or (illegible text) of the Earth
Density 0.60419 of the Earth
Density 3.444 Water being unity
Force of Gravity at the surface 0.16489 or 1/6064 of the Earth
Angle subtended by one degree of selenographical longitude or latitude at the centre of the Moon's disk when at its mean distance 16.″ 566
Linear value of the same 18.871 miles (30.370 km.)
Selenographical are at the centre of the Moon's disk, when at mean distance subtending an angle of one second of are 3′ 37.″ 31
Linear value of the same 1.139 miles (1.833 km.)

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