An eclipse is an astronomical event that occurs when an astronomical object or spacecraft is temporarily obscured, by passing into the shadow of another body or by having another body pass between it and the viewer. This alignment of three celestial objects is known as a syzygy. Apart from syzygy, the term eclipse is also used when a spacecraft reaches a position where it can observe two celestial bodies so aligned. An eclipse is the result of either an occultation or a transit. The term eclipse is most often used to describe either a solar eclipse, when the Moon's shadow crosses the Earth's surface, or a lunar eclipse, when the Moon moves into the Earth's shadow. However, it can also refer to such events beyond the Earth–Moon system: for example, a planet moving into the shadow cast by one of its moons, a moon passing into the shadow cast by its host planet, or a moon passing into the shadow of another moon.

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Obama hosted the first White House Star Party in 2009. Thomas Jefferson was the first president to look through an astronomical telescope at the White House. Jefferson owned telescopes and made careful notes for an annular eclipse observed from his home, Monticello

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Jesuit priest Angelo Secchi pioneered astropohysics. In 1860 he was one of the first people to photograph the sun during an eclipse and proved that the sun’s corona was real and not just an optical illusion

King Louis XIV of France covered his telescope’s objective lens with a piece of smoked glass to view the solar eclipse. This method remained popular for a couple hundred years until the 1930s when products such as the Eclipse-o-scope became available

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