A fascinating astronomical event is set to take place on Wednesday night, as unusual formations resembling the letters X and V will become visible on the Moon’s surface. This rare occurrence can be observed for approximately four hours as the Moon nears its first quarter phase, with both shapes emerging from sunlight illuminating specific craters at precisely the right angles.
The lunar V is created when light strikes the Ukert crater, while the lunar X is formed by the Bianchini, La Caille, and Purbach craters. To catch a glimpse of these formations, viewers will need a telescope or binoculars aimed at the Moon’s terminator—the dividing line between the illuminated and dark sides of the Moon.
The terminator is particularly intriguing for amateur astronomers, as the varying shadows enhance the Moon’s topography. According to NASA, “the lunar surface appears different nearer the terminator because the Sun is nearer the horizon, causing shadows to be longer, which helps discern features and gives a three-dimensional appearance.”
This spectacular sight is expected to begin at 4:41 AM on July 3rd. Weather forecasts from the Met Office indicate that the skies over the British Isles should be mostly clear during this time, although regions in Wales and the west coast of Ireland may experience some cloud cover.
Notably, astronomer David Chapman has highlighted that the appearance of the lunar X occurs gradually over a period of two hours and 20 minutes, as the Sun rises in that area. This unique phenomenon offers a captivating opportunity for both seasoned astronomers and casual observers to explore the wonders of the lunar landscape.
Such celestial events not only enhance our understanding of lunar geography but also inspire a sense of awe about the universe we inhabit. Whether you are an experienced astronomer or simply curious about the night sky, this extraordinary formation will be worth observing.