Roden Crater

Major Lunar Standstill:  West Side of Image Stone

Every 18.61 years (the most recent was 2006) the moon reaches its northernmost and southernmost maximums known as a Major Lunar Standstill. Viewed through the tunnel, the southernmost moonset will form a reverse image on the west side of the image stone. The next Major Lunar Standstill is calculated to be at apogee in 2025.