This three different solar eclipse occurred with the sun, moon and Earth all three of the mutual changes of position, and also decided on the Moon and the distance between the Earth changes.

这三种不同的日食的发生跟太阳、月球和地球三者的相互变化着的位置有关，并且也决定于月球与地球之间的距离变化。

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This is because only in that day, the moon will appear in the sun and the connection between the Earth, so will it be possible to block the sun and the moon formed the solar eclipse.

这是因为只有在那一天，月亮才会出现在太阳与地球之间的连线上，这样才有可能使月球挡住太阳而形成日食。

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The last total lunar eclipse - when the sun, Earth and Moon are almost exactly in line, with the Moon and sun on opposite sides of the planet - was in February 2008.

上一次日食发生在2008年2月，当时太阳，地球和月亮完全在同一条直线上，月亮和太阳分别在地球的两边。

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Astronomers use the observatory to study the positions and movements of the Earth, sun,moon and other objects in space.

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And the fact that the sun and moon were particularly close to the Earth at precisely the same time -- well, that made the tidal bulges even bigger.

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Donald Olson and Thomas Lytle of Southwest Texas State University have calculated the tidal forces exerted on the earth by the sun, the moon and the planets.

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The phases of the moon occur due to cycles among the moon, the earth and the sun.

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