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SCIENCE   28 August 2007, 11:04PM

CREDIT: Wikipedia (Added by Infonews Editor) - 1137 views ID: 753

Ecliptic orbit
The moon crosses the ecliptic every orbit at positions called nodes. When the full moon occurs in the same position at the node, a lunar eclipse can occur. These two nodes allow two eclipses per year, separated by approximately six months.

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