
GeoAstro Applets 
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Chaos Game 
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Miscel laneous 
Physics Quiz 
Who is Who ? 
The applet is also computing the geocentric and topocentric distance of the Moon from the Earth (accuracy better than +/ 10 km between 1900 and 2050), the apparent angular size (arc minutes), the illuminated fraction of the Moon's disc (per cent), and the Moon's phase: 0.00 = new MoonThe altitude is taking into account the horizontal parallax of the Moon.
The
computations are performed following Jean Meeus.
Select "Write Data" from the Details menu: F(EM)/F(SM) is the ratio of the gravitation forces between Earth and Moon F(EM) to Sun and Moon F(SM). The mean value of about 0.45 for the Earth's Moon is unique in the solar system: Details The axial tidal acceleration a by the Moon is approximately: Earth's radius r=6371 km, Moon's mass =7.349 10^{22} kg, distance EarthMoon R (356.000 km < R < 407.000 km). More about tides Select "Diagram" from the Details menu: The change of distance may be up to about 6,300 km per day. The mean perigee distance of 284 anomalistic months is 362562.4 km. The maximum lunar declination 23.44°
+ 5.15° = 28.6° (Major Lunar Standstill in
2006):
At 28.6°
N or 28.6° S the daily topocentric difference of
the Moon's distance from Earth will reach the
diameter of the Earth.
At the North pole the topocentric
lunar distance will have no diurnal change:



Please visit my Moon Applet Collection
Visit
my
page: The
Moon: orbit and phases
©
20062018 J. Giesen
Last
modified:
2018,
Aug 28