barycentre

(from the article `Moon`) Although the Moon is commonly described as orbiting Earth, it is more accurate to say that the two bodies orbit each other about a common centre of ...
Found on http://www.britannica.com/eb/a-z/b/26

Barycentre

The center of gravity of the Earth and moon.
Found on http://www.kidsastronomy.com/dictionary.htm

Barycentre

The centre of gravity of the Earth-Moon system. The Earth is 81 times the mass of the Moon and the barycentre of the Earth-Moon system actually lies inside the Earth.
Found on http://www.encyclo.co.uk/local/20448

Barycentre

This is the centre of gravity of 2 or more masses; the centre of mass of the Earth and Moon and is actually located within the Earth. See also: Earth, Moon.
Found on http://www.diracdelta.co.uk/science/source/b/a/barycentre/source.html
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