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This weekend is all about the moon, once again. We will be treated to a full moon on the July 4 but before that happens, there will be a penumbral lunar eclipse. According to In-The-Sky.org, this occurs whenever the Earth passes between the moon and sun and it obscures the sunlight enough to cast a shadow onto the moon's surface. Unlike other kinds of eclipses, these are extremely subtle events to observe. In addition, no more than 35% of the moon's face will pass within the Earth's penumbra. This is the outer part of the Earth's shadow, in which the Earth appears to cover part of the sun, but not all of it. Even at the moment of greatest eclipse, it will be especially difficult to notice any reduction in the moon's brightness. The moon will pass through the Earth's shadow on Friday, between 8:10 p.m. and almost midnight, creating a penumbral lunar eclipse. It will be visible from San Mateo in the southeastern sky. Look for the moon close to the horizon at the moment of greatest eclipse.

It won’t be difficult to see the full moon on the Fourth of July. According to the Farmer’s Almanac, July’s full moon is called the Buck Moon because a buck’s antlers are in full growth at this time. It’s also known as the Thunder Moon because thunderstorms are so frequent during this month.

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