"Shine On, Shine On Harvest Moon...."



Image Credit: Dan Bush of Missouri Skies



Harvest Moon 2012

The Harvest Moon is coming this weekend! The moon has been waxing larger each night, and full moon is the night of September 29-30, 2012. In traditional skylore, the Harvest Moon is the full moon closest to the autumnal equinox. For us in the Northern Hemisphere, the autumnal equinox came on September 22. That makes the September 29-30 full moon the Harvest Moon.

There’s also a name for the next full moon after the Harvest Moon. It’s called the Hunter’s Moon, and it’ll come this year on October 29.

Officially, the crest of the full Harvest Moon will happen on September 29, 2012 at 10:19 p.m. CDT (3:19 on September 30 Universal Time). Depending upon your time zone, the full moon will be September 29 or 30. But the moon will appear round and full on all the nights around this full moon.

So don’t just look for the Harvest Moon on the night of September 29 or 30. Look for the moon to be bright and full-looking for several nights at the end of September, 2012. If you live far enough north – for example, in the northern states, Canada or Alaska – the Harvest Moon will continue to shine from dusk until dawn into early October. This procession of moonlit nights is what characterizes the Harvest Moon.
Why is the Harvest Moon special?

Harvest Moon is just a name. It’s the name for the full moon nearest the autumnal equinox. In the Northern Hemisphere, you’ll always see the Harvest Moon in either September or October. In the Southern Hemisphere, a moon with these same characteristics always comes in March or April.
But the Harvest Moon is more. Nature is particularly cooperative around the time of the autumn equinox to make the full moonrises unique around this time.

Here’s what happens. On average, the moon rises about 50 minutes later each day. But when a full moon happens close to the autumnal equinox, the moon (at mid-temperate latitudes) rises only about 30 minutes later daily for several days before and after the full Harvest moon. Why? The reason is that the ecliptic – or the moon’s orbital path – makes a narrow angle with the evening horizon around the time of the autumn equinox. The narrow angle of the ecliptic results in a shorter-than-usual rising time between successive moonrises around the full Harvest Moon.

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Bottom line: The Harvest Moon will come in late September in 2012. The Harvest Moon is the full moon closest to the autumnal equinox, which in 2012 comes on September 22. So the full moon of September 29-30 is 2012′s Harvest Moon. October 1 will have a beautiful bright full-looking moon, too. The Harvest Moon is not really bigger, brighter or more pumpkin-colored than other full moons, but it’s special because, at this time of year in the Northern Hemisphere, the time between successive moonrises is shorter than usual. Enjoy.

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