On Friday the 13th, a full 'harvest moon' will be visible in the night sky

A full “harvest moon” will be visible in the night sky this Friday the 13th and the following day, and though the timing sounds a bit ominous, there’s no reason to be spooked by this skywatching event.

This full moon is a so-called mini moon because it occurs when the moon is at its most distant point in its elliptical orbit around Earth, a point some 252,000 miles away that astronomers call lunar apogee. When the opposite occurs — when the moon turns full at its nearest point to Earth, called lunar perigee — it becomes a supermoon.

Though mini moons — also known as micromoons — appear smaller and fainter than moons at other points in the lunar cycle, the differences are usually too subtle to be noticed with the naked eye. “It will look a bit smaller and about 13 percent fainter than average, but it’s not a huge effect,” said Patrick Hartigan, an astrophysicist at Rice University in Houston.

In the Northern Hemisphere, September’s full moon is traditionally called the harvest moon because it occurs close to the peak of the fall harvest season. “There are several nights in a row where, right after sunset, the moon will hang near the horizon,” Hartigan said. “That’s why people used that as natural light to help them with the harvest.”

source: nbcnews.com