The rare lunar event, often referred to as a “lunar standstill,” takes place every 18.6 years when the moon’s path in the sky dramatically shifts. Some archaeologists argue that certain ancient structures, like Stonehenge, had been built as astronomical tools, with their arrangement corresponding with these shifts, hence acting as a lunar calendar of sorts.
During a lunar standstill, the range of the moon’s rising and setting points at the horizon is at its most extreme for a few