Basic Astronomy


Moon is the only natural satellite to Earth.

With 3476 km diameter, Moon is the fifth largest satellite of the Solar System. Moon is over a quarter of the diameter of the Earth and it is about 1/81 Earth mass.


(Picture Credit: Dusmanta Patra)

Neil Armstrong and Buzz Aldrin was first two persons who stepped on moon. Neil Armstrong was the mission commander of Apollo 11 moon landing mission. Neil Armstrong and Buzz Aldrin spent two and half hour on lunar surface. Michel Collins remained in the orbit of the moon to take care of the command module when Armstrong and Aldrin was on moon.

Mass7.348 1022 kgDiameter3,476 km
Mean density3.34 g / cm3Inclination of equator to orbital plane6.68 degree
Mean distance from earth384,400 kmEccentricity0.055
Orbital period27.322 daysAxial rotation period27.322 days

Apogee and Perigee of moon in 2013 2014 2015

Full moon and New moon in 2013 2014 2015

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