A rare blue moon is set to light up the night sky on May 31, 2026, marking one of the most awaited lunar events of the year. According to space experts and reports from NASA and EarthSky, this will be the first calendar blue moon since August 30, 2023. Although it will appear slightly smaller than usual due to its position in orbit, the event is still expected to draw global attention from astronomy enthusiasts and skywatchers alike.