Conjunction of the Moon and Mars
The waxing crescent Moon will appear near Mars in the western sky after sunset on April 17th.
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Occlusion of Mars by the Moon
The Moon will pass in front of Mars, creating a lunar occultation visible from parts of Asia on April 17th.
J. A. Fleming died, 1945 (b. 1849).
Illustration from the Bibliographical Memoirs of Fellows of the Royal Society, 1945. The Royal Society, London. Sir John Ambrose Fleming FRS died in 1945, aged 95 (born 29 November 1849). […]
Sup. Conjunction of Mercury
Mercury will pass very close to the Sun in the sky as its orbit carries it around the far side of the solar system from the Earth.
First Quarter Moon
The First Quarter Moon occurs on April 19th - it is visible high in the southern sky in early evening.
World Creativity and Innovation Day.
During World Creativity and Innovation Day, April 21 (WCID) and Week April 15 – 21 (WCIW) individuals, families, teams, leaders, nations, organizations, students, and communities are acknowledged informed inspired encouraged […]
Lyrids Meteor Shower
Peak: ~Apr 21-22, 2020 The Lyrids are a medium strength shower that usually produces good rates for three nights centered on the maximum. These meteors also usually lack persistent trains […]
International Earth Day
First held in 1970, Earth Day is held annually on April 22 to demonstrate support for environmental protection.
International Girls in Information and Communications Technology (ICT) Day
On Girls in ICT Day– marked annually on the fourth Thursday in April – the United Nations International Telecommunication Union (ITU) is highlighting the need to promote technology career opportunities for girls and […]
Space Shuttle Discovery launched with Hubble Space Telescope, 1990
The Hubble Space Telescope was launched into orbit aboard the Space Shuttle Discovery on April 24, 1990.
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.