The third and final supermoon of the summer's lunar trilogy will rise on Monday.
The full phase of the harvest moon will occur at 9:38 p.m Sept. 8, but it will be closest to Earth at 11:38 p.m. on Sept. 7, National Geographic reported.
At its closes point, the moon will be only 222,698 miles from Earth. The harvest supermoon will be 15 percent brighter and 7 percent larger than the typical full moon.
The supermoon that took place on Aug. 10 was the closest and brightest this year at only 221,765 miles from Earth.
An October harvest moon occurs about once every four years; the last one occurred in 2009, but the next one will not be until 2017, while the following one will rise only three years later, Space.com reported.
Once a month the moon reaches its closest point to Earth, called the perigee, and appears larger in diameter. During this time the moon passes opposite the sun, causing it to be illuminated, National Geographic reported. When the perigee happens at the same time as a the full moon, a supermoon occurs.
"It's the marriage of the two occurrences when we get a brighter and larger-than-normal full moon," Geza Gyuk, astronomer at the Adler Planetarium in Chicago, told National Geographic. "While this is nothing special from a science perspective, it is no doubt very poetical and very romantic."
The supermoon will be visible all night and will appear on the eastern horizon just after sunset, and it will set in the west. The rising and setting times will most likely provide the best photograph opportunities.
"Try and look for the moon when it is near the horizon, that's when it gives an extra thrill, as it appears larger and more colorful than when it is overhead," Gyuk told National Geographic.
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