Harvest Moon
What are you trying to find out about Harvest Moon Time?
Last night I looked up and noticed what looked to me like a full moon, but apparently it’s actually the Harvest Moon tonight, Wednesday September 26th. Harvest Moon is not just a fancy name for the full moon at around harvest time, it behaves in a special way. Throughout the year the Moon rises, on average, about 50 minutes later each day. So when you get a near full moon close to sunset, that only lasts for a day or two. Then you’re back to waiting until later in the evening before moonlight appears. This used to be very important for farmers at harvest time in the days before electric lighting, Mercedes Benz tractors and bright halogen spotlights added to the rack of headlamps. That’s because near to the autumn equinox, which came this year on Sunday Sept. 23rd, the daily difference in the time when the moon rises is only by 30 minutes each day. So you get several moonlit early evenings in a row which is just perfect for getting the harvest in. The Moon rises at about sunset tonight, and then not long afterwards for the next few evenings, as indeed did the one I noticed yesterday and the day before when it was noticeably less than full.
Now then, if you happen to be reading this in southern hemisphere, then it’s currently springtime and your full Moon behaves in exactly the opposite way. There will be an extra long time between moonrises from one evening to the next, which isn’t a particularly useful phenomenon, nor does it have a special name as far as I can gather, but no doubt you will get your autumnal Harvest Moon in March next year when we in the north are having our vernal equinox (March 20th 2008).
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Andy Roberts is a writer who initiated DARnet. Catch me on 
Thank you. I have always enjoyed Harvest Moons (discovering the Niel Young song titled Harvest Moon reinforced my call to celebrate it). It is good to have it explained.
You’re welcome. I used to get asked to play Neil Young songs from time to time. I never wanted to learn any though, so I made fun of their inability to pronounce his name which is very mean of me really. When I wrote the blog post I wasn’t aware that Harvest Moon was a Neil Young song, but never mind – at least it wasn’t “Heart of Gold”!
OK, so when is the Harvest Moon Time?
Well this post was written in September 2007 and refers to the Harvest Moon that occurs around the time of autumn equinox in the Northern Hemisphere. That’s usually September.
If you’re in the Southern half of the world though, below the equator, then the Harvest Moon Time would be in March, coming up soon. In fact the equinox is on March 20th in 2009, the same date as last year so the nearest full moon to that date is the one you want.