All Day

Mercury at Perihelion

Mercury's 88-day orbit around the Sun will carry it to its closest point to the Sun – its perihelion – at a distance of 0.31 AU from the Sun.

International Chernobyl Disaster Remembrance Day

An explosion at the Chernobyl Nuclear Power Plant in 1986 spread a radioactive cloud over large parts of the Soviet Union; millions of people in the three countries were exposed to the radiation.

Full Moon

The Full Moon rises at sunset, is visible high in the sky around midnight, and is visible all night.