September's new moon will partially eclipse the sun, though the eclipse will only be visible from the southern Pacific Ocean and Antarctica.

A new moon is when the moon shares the same celestial longitude as the sun; the two bodies are said to be in conjunction. This occurs about every 29.5 days. The exact moment of this months' new moon occurs today (Sept. 21) at 3:54 p.m. EDT (1954 GMT).

This also puts the moon between the sun and Earth, and if the new moon is perfectly lined up with the sun, we see a solar eclipse. Solar eclipses aren't visible from everywhere on Earth because the moon's shadow only covers a small part of the Earth's surface, so while solar eclipses happen about twice a year, a given point on Earth will be in the moon's shadow a lot less often.

Solar eclipses can be

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