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Harvest Moon

Tommorrow night (Friday, October 6) there will be full Harvest Moon at 11:13 PM EDT or at at 03:13 UT on October 7th.

Now, according to NASA, there are a couple of odd things that happen during a full moon. The better to observe during the Harvest Moon which appears larger than most of the other full moons during the course of the year.

Moonlight steals color from whatever it touches. Regard a rose. In full moonlight, the flower is brightly lit and even casts a shadow, but the red is gone, replaced by shades of gray. In fact, the whole landscape is that way. It’s a bit like seeing the world through an old black and white TV set.

And if that’s not interesting enough to test. There’s this:

If you stare at the gray landscape long enough, it turns blue. The best place to see this effect, called the “blueshift” or “Purkinje shift” after the 19th century scientist Johannes Purkinje who first described it, is in the countryside far from artificial lights. As your eyes become maximally dark adapted, the blue appears. Film producers often put a blue filter over the lens when filming night scenes to create a more natural feel, and artists add blue to paintings of nightscapes for the same reason. Yet if you look up at the full moon, it is certainly not blue. (Note: Fine ash from volcanoes or forest fires can turn moons blue, but that’s another story.)

NASA adds this bit of “you might possibly be the exception” information:

This story makes some generalizations about what people can see at night but, as with all things human, there are exceptions: Some people can read by moonlight; others have no trouble seeing the red petals of a moonlit rose. These people have “moonvision,” boosted by an extra-helping of rods or unusually sensitive cones. Are you one of them?

Well, I intend to find out if the skies are clear enough to see the full moon tomorrow night. I’ve noticed the blue landscape in the past, but I don’t think I’ve ever tried to look at a rose or other colored flower in the moonlight. Will I see color or gray? Will I be able to read by moonlight? Can’t wait to find out.

Posted on 10/05/06 at 08:35 PM
 




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