On May 31, 2026, the Anna Science Centre-Planetarium in Tiruchi hosted a public viewing event for the rare 'Blue Moon', drawing many astronomy enthusiasts. Attendees had the chance to observe the full moon through telescopes set up by the planetarium. A blue moon is defined as the second full moon occurring within a single calendar month. In May 2026, the first full moon appeared on May 1, followed by another on May 31, marking it as a blue moon. The phenomenon is rare due to the lunar cycle, which lasts approximately 29.5 days, leading to occasional additional full moons in months with 30 or 31 days. The project director noted that the next blue moon is expected on January 31, 2037. Visitors also learned about the even rarer 'True Blue Moon', which can appear bluish due to specific atmospheric conditions, such as dust or smoke particles from natural disasters. A historical reference was made to the notable bluish appearance of the moon after the Krakatoa volcano erupted in 1883.