The 'Super Blood Harvest Moon' is coming this month

You might call September's full moon the "Super Blood Harvest Moon." Here's what that means.

This month's full moon is a special one -- you might call it the "Super Blood Harvest Moon" because of a few rare coincidences.

It's coming Sept. 27 at 10:50 p.m.

For starters, it is what some astronomy enthusiasts call a "super" moon because it will occur when the moon is close to perigee, its nearest point to Earth in its elliptical orbit.

The moon reaches perigee Sept. 28, and it will be just more than 222,000 miles away at the time of the full moon. That is about 31,000 miles closer than lunar apogee, the moon's farthest point in its orbit.

The moon appears about 14 percent bigger and 30 percent brighter at perigee than it does at apogee, according to NASA. But it doesn't look dramatically different to the naked eye.

The full moon also comes with a full lunar eclipse, all of which will be visible from Baltimore and the rest of the eastern half of the United States. Such eclipses can give the moon a reddish tint, caused by light bending through Earth's atmosphere.

It is the last of four consecutive lunar eclipses -- two in 2014 and two this year -- known as a tetrad.

The moon will start to dim in Earth's shadow at 8:11 p.m., with a noticeable shadow by 9:07 p.m. and total eclipse beginning at 10:11 p.m. The total eclipse ends at 11:23 p.m., hitting its peak in the middle at 10:48 p.m., just two minutes before the moment the moon becomes technically full.

This month's full moon is known as the Harvest Moon because it is the first that will occur after the autumnal equinox Sept. 23. It is perhaps the best known of the full moon's nicknames, long helping farmers work into the night gathering crops.

Cross your fingers for clear skies.

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