Calendar

Inf. Conjunction of Mercury

Mercury passes very close to the Sun in the sky as its orbit carries it between the Sun and Earth. This happens once in 116 days (the synodic cycle of […]

Moon at Apogee

The Moon’s distance from Earth varies throughout its monthly orbit because the Moon’s orbit isn’t perfectly circular. Every month, the Moon’s eccentric orbit carries it to apogee – its most distant point from […]

Last Quarter Moon

The Moon is at Last Quarter (or Third Quarter) – rising around midnight, and visible to the south after sunrise.

Martin Luther King Jr. Day.

"Martin Luther King Jr. (January 15, 1929 – April 4, 1968) was an American Baptist minister and activist who became the most visible spokesperson and leader in the civil rights movement from 1955 until his assassination […]

New Moon

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 […]

International Holocaust Remembrance Day

The United Nations General Assembly designated January 27—the anniversary of the liberation of Auschwitz-Birkenau—as International Holocaust Remembrance Day. On this annual day of commemoration, the UN urges every member state to honor […]

First Quarter Moon

The Moon is at First quarter on this date -it will be visible high in the southern sky in early evening.

Bertrand Russell died, 1970 (b. 1872).

Bertrand Arthur William Russell, 3rd Earl Russell, OM FRS (/ˈrʌsəl/; 18 May 1872 – 2 February 1970) was a British philosopher, logician, mathematician, historian, writer, essayist, social critic, political activist, and Nobel laureate. At various points in […]

Presentation of the Lord (Candlemas).

A tapestry from Strasbourg depicting the Purification of the Virgin Mary and the Presentation of Jesus at the Temple. Candlemas (also spelled Candlemass), also known as the Feast of the Presentation of Jesus […]

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.

Full Moon

The Full Moon rises at sunset, and is visible all night. The Vatican Observatory's monthly Full Moon Meetup for Sacred Space Astronomy subscribers is held at 10:00 AM Tucson time.