April new moon 2021: Planets become more visible before the moon occults Mars

The new moon occurs Sunday (April 11), at 10:30 p.m. EDT (0230 GMT on April 12), a week before our natural satellite passes in front of Mars.

New moons occur when the moon is directly between the Earth and sun, and the two are at the same celestial longitude, a projection of the Earth’s longitude lines on the celestial sphere. The position is called a conjunction. As the illuminated side of the moon faces away from Earth, unless there is a solar eclipse (in which the moon passes directly in front of the sun), they are invisible to earthbound observers. 


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