Ring-shaped (ring) solar eclipses - at present, the rarest kind of eclipses, they account for only 5%. If the trajectory of the Moon moves near the center of the Sun, but the apparent angular diameter of the Moon is less than the Sun's, at the moment of alignment of the centers, the Moon can not obscure the Sun completely and around it a glow is created in the form of a ring, this eclipse is called annular, but in oral speech, express the meaning as briefly as possible set the expression of the circular eclipse.
This happens when the new moon - the conjunction of the Sun and the Moon - occurs near one of the Moon Nodes. A solar eclipse occurs when the Moon passes between the Sun and the Earth, covering part of the solar disk.
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