Because it’s a bit larger and more pronounced, Lunar V remains visible for a little while after the X fades.Read more Internet Backs Worker Refusing to Pitch in $20 for CEO's Christmas PresentĪt the time of writing, the post has earned over 17,000 interactions on Twitter, with fellow users flocking to reassure the original poster that she is not alone in seeing what she saw. The V sits on the terminator line at the same time as Lunar X, but much higher up. Once you’ve spotted the X, you may want to look for the Lunar V, another “letter” formed by light bouncing off of the Moon’s craters. Just slowly follow the terminator line upward from the bottom edge of the Moon until the X comes into view.Ĭheck our Moon Phase Calendar to know when the Moon is in the First Quarter Phase. Though it can’t be discerned with the naked eye, a good set of tripod-mounted binoculars or a small telescope are all that’s needed to find it. The feature, which can be seen in daylight, sits on the lower half of the Moon’s surface, which is pocked with numerous craters. The bright silvery X appears right along the lunar terminator, the line that separates the light and dark sides of the Moon. The phenomenon is visible for a few hours each month, about six hours before the Moon enters its First Quarter phase. It wasn’t until the mid-2000s that stalking the feature became popular, thanks to reports published on the Internet. William Busler in June of 1974, though it’s likely that the feature was known informally prior to that. The first documented sighting of Lunar X was made by Tennessee astronomer Dr. The mental process responsible for pareidolia takes place in the same part of our brains that is responsible for facial recognition, which is probably why so many examples of the phenomenon involve imagining human faces, such as the Man in the Moon or New Hampshire’s late, great Old Man of the Mountain. And for our forebears, those split seconds could make all the difference between eating or being eaten. By using this form of mental shorthand to instantly match new visual data to stored memories, our prehistoric ancestors were able to recognize food sources or predators more quickly. Scientists suggest there is actually an evolutionary advantage to pareidolia. The name for this phenomenon comes from the Greek words for “image” and “instead of.” In other words, pareidolia is when we see an image of something instead of what’s really there. This same process is what allows us to imagine shapes in the clouds, star formations, abstract art, and even burn marks on toast. Lunar X is an example of pareidolia, or the tendency of the human mind to discern familiar objects when looking at random patterns. But the Lunar X, as it’s most commonly known (other names include the Purbach cross or the Werner X), isn’t a message from some distant alien race, or the ingenious hiding place for an extraterrestrial treasure.Īctually, the X isn’t even real it’s just an optical illusion created for a very brief time each month when the light from the Sun reflects off of the ridges of a group of three lunar craters- Purbach, LaCaille, and Blanchinus-at just the right angle. It was once even as good as a signature in the time before most people were literate.Īnd despite the protests of many who see the abbreviation “Xmas” as a sacrilege, X has long been used by religious scholars as a symbol to represent Jesus, because it’s the Latin equivalent of the Greek letter Chi, the abbreviation for “Christ.” What is Lunar X?Īll of that might make it seem a little eerie that a great big letter X graces the surface of the Moon. It can be the symbol for a destination on a map-perhaps of a buried treasure, as in “X marks the spot”-or a kiss. The letter that represents an unknown quantity in an algebraic equation, X has come to be associated with anything unknown or mysterious, as in Planet X and X-rays. Of all the letters in our Roman alphabet, X is perhaps the one imbued with the most intrigue.
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