ometimes, as seen from the vantage of the Great House Pueblo at Chimney Rock National Monument, the full moon rises in a narrow gap between the monument’s namesake twin stone pillars near Pagosa Springs. In fact, the phenomenon occurs only on certain nights, when the moon rises farther north than usual, during the northern major lunar standstill (MLS)—a period of 36 months that comes around every 18.6 years.
