Lunar eclipses are occultations of the Moon by the shadow of the Earth, while solar eclipses are occultations of the Sun by the shadow of the Moon. These celestial concordances are frequently observed, at least one of each (lunar eclipse or solar eclipse) every 6 months.
Eclipses take place at syzygies, that is to say when there is a quasi alignment between the Sun, the Earth and the Moon. The solar eclipse takes place at the new moon, the lunar eclipse takes place at the full moon.
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Lunar Eclipse, Celestial Concordance
Solar eclipse
Diamond rings over the pacific
Mercury in front of the huge Sun
The Moon Illusion
Eclipses explained by the plane of the orbit
Solar eclipse seen by satellite
Transit of Venus on June 6, 2012
Transit of the Moon in front of the Sun
Impact theory at the origin of the Moon
Cycle of Saros and Exeligmos
Superb annular eclipse of 2010