Global Astronomy Month
Astronomers Without Borders brings the world together to share our passion of astronomy and the wonders of the Universe.
Calendar
42 events found.
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.
New Moon 2025
New Moon. By the modern definition, New Moon occurs when the Moon and Sun are at the same geocentric ecliptic longitude. The part of the Moon facing us is completely […]
World Day for Safety and Health at Work
The World Day for Safety and Health at Work will focus on addressing the outbreak of infectious diseases at work, in particular, on the COVID-19 pandemic.
First Quarter Moon 2025
The Moon is at First quarter on this date -it will be visible high in the southern sky in early evening.
Cinco de Mayo
Mother's Day in the United States is an annual holiday celebrated on the second Sunday in May. Mother's Day recognizes mothers, motherhood and maternal bonds in general, as well as the […]
Mother’s Day (USA)
Mother's Day in the United States is an annual holiday celebrated on the second Sunday in May. Mother's Day recognizes mothers, motherhood and maternal bonds in general, as well as the […]
World Metrology Day.
World Metrology Day is an annual celebration of the signature of the Metre Convention on 20 May 1875 by representatives of seventeen nations. The Convention set the framework for global […]
Last Quarter Moon
The Moon is at Last Quarter (or Third Quarter) – rising around midnight, and visible to the south after sunrise.
Last Quarter Moon 2025
The Moon is at Last Quarter (or Third Quarter) – rising around midnight, and visible to the south after sunrise.
Memorial Day
Memorial Day is an American holiday, observed on the last Monday of May, honoring the men and women who died while serving in the U.S. military. Memorial Day 2021 will […]
World Bicycle Day.
In April 2018, the United Nations General Assembly declared June 3 as International World Bicycle Day. The resolution for World Bicycle Day recognizes "the uniqueness, longevity and versatility of the bicycle, which has been in use for two […]
Venus at Aphelion.
Venus's 225-day orbit around the Sun will carry it to its furthest point to the Sun – its aphelion – at a distance of 0.73 AU.
Charles Babbage’s paper on the difference engine, 1822
Charles Babbage (1791-1871), computer pioneer, designed two classes of engine, Difference Engines, and Analytical Engines. Difference engines are so called because of the mathematical principle on which they are based, […]
Summer Solstice
The summer solstice is the day when the Sun appears to reach its highest point in the sky during the year - it marks the start of summer in the Northern Hemisphere.
International Asteroid Day
International Asteroid Day is a United Nations-recognized day observed each year on the anniversary of the Tunguska impact event of June 30, 1908.
Canada Day.
Canada Day (French: Fête du Canada) is the national day of Canada. A federal statutory holiday, it celebrates the anniversary of July 1, 1867, the effective date of the Constitution Act, 1867 (then called the British North America Act, […]
Thomas Harriot, mapped the Moon with a telescope 4 months before Galileo (d. 1621)
Thomas Harriot was an English astronomer, mathematician, ethnographer and translator who made advances within the scientific field. Thomas Harriot was recognized for his contributions in astronomy, mathematics, and navigational techniques. Harriot worked closely with John White to create advanced […]
Earth at Aphelion
Earth will be at the farthest point in its orbit around the Sun on this date
Independence Day (USA)
Independence Day is a U.S. federal holiday commemorating the Declaration of Independence of the United States, on July 4, 1776.
NASA’s Pathfinder lands on Mars, 1977
Mars Pathfinder was launched December 4, 1996 and landed on Mars' Ares Vallis on July 4, 1997.
Mercury at Aphelion
Mercury's 88-day orbit around the Sun will carry it to its furthest point to the Sun – its aphelion – at a distance of 0.47 AU.
Thomas Kuhn born 1922
Thomas Samuel Kuhn (1922–1996) is one of the most influential philosophers of science of the twentieth century,
J. G. Mendel born 1822
Gregor Johann Mendel (1822– 1884) was a biologist, meteorologist, mathematician, Augustinian friar and abbot of St. Thomas' Abbey in Brünn (Brno), Margraviate of Moravia.
St. Ignatius Loyola, Founder of the Jesuits.
Ignatius of Loyola (Basque: Ignazio Loiolakoa; Spanish: Ignacio de Loyola; Latin: Ignatius de Loyola; c. 23 October 1491 – 31 July 1556) was a Spanish Basque Catholic priest and theologian, who co-founded the religious order called the Society of Jesus (Jesuits) and became its first Superior General at […]
St Dominic, Patron of Astronomers, d. 1221
The liturgical celebration of St Dominic is on August 6 which is his deathday, in 1221 - his birthday is August 8.
Many sources state that St Dominic is the patron saint of astronomy and astronomers.
Perseids Meteor Shower
The Perseids are the most popular meteor shower as they peak on warm August nights as seen from the northern hemisphere. The Perseids are active from July 17 to August 24, peaking on August 12 - 13.
Assumption of the Blessed Virgin Mary
The Assumption of the Blessed Virgin Mary is, according to the beliefs of numerous Churches, the bodily taking up of Mary, the mother of Jesus, into Heaven at the end of her earthly life. The analogous feast […]
Labor Day (USA)
Labor Day is a federal holiday in the United States celebrated on the first Monday in September in any given year (i.e. a single day from September 1 through September 7) to honor and recognize […]
Frank Drake died, 2022 (b. 1930)
Frank Donald Drake (May 28, 1930 – September 2, 2022) was an American astronomer and astrophysicist. He was involved in the search for extraterrestrial intelligence, including the founding of SETI.
Autumnal Equinox
Fall begins with the autumnal equinox - in the Northern Hemisphere, it's the September equinox; in the Southern Hemisphere, it is the equinox in March.
Venus at Perihelion
The planet Venus is a Perihelion (its closest approach to the Sun) on this date.