Hold a pencil in front of your eye at a position where its end just blocks out the sun. Make appropriate measurements to estimate the diameter of the sun, given that the earth-sun distance (mean) is 149.6 X 10^6 km.
2007-02-15 12:46:58 · 2 answers · asked by Ladi 2 in Science & Mathematics ➔ Astronomy & Space
The Moon is about one-third the size of the Earth and has a diameter of 3,474 kilometres (2,159 miles).
The average distance from the Earth to the Moon is 384,399 kilometres (238,854 miles), which is about 30 times the diameter of the Earth.
Physical characteristics
Mean radius: 1,737.103 km (0.273 Earths)
Equatorial radius: 1,738.14 km (0.273 Earths)
Polar radius: 1,735.97 km (0.273 Earths)
Oblateness: 0.00125
Equatorial circumference: 10916 km
Surface area: 3.793×107 km² (0.074 Earths)
Volume: 2.1958×1010 km³ (0.020 Earths)
Mass: 7.3477×1022 kg (0.0123 Earths)
Mean density: 3,346.4 kg/m3
Equatorial surface gravity: 1.622 m/s2 (0.1654 g)
Escape velocity: 2.38 km/s (5324 mph)
Sidereal rotation period: 27.321 582 d (synchronous)
Rotation velocity at equator: 4.627 m/s (10.349 mph)
Axial tilt: 1.5424° (to ecliptic)
Obliquity: 6.687° (to orbit plane)
Albedo: 0.12
Surface temp.:
equator
85°N min mean max
100 K 220 K 390 K
70 K 130 K 230 K
Apparent magnitude: up to -12.74
Angular size: from 29′to 33′
2007-02-15 13:05:32 · answer #1 · answered by hyaki ikari 2 · 0⤊ 0⤋
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2015-04-13 07:50:25 · answer #2 · answered by clifford 1 · 0⤊ 0⤋