Calendar

Astronomy Day

Astronomy Day is an international event observed each fall and spring near the first quarter Moon. Local astronomical societies, planetariums, museums, and observatories sponsor public viewing sessions, presentations, workshops, and […]

Astronomy Day

Astronomy Day is an international event observed each fall and spring near the first quarter Moon. Local astronomical societies, planetariums, museums, and observatories sponsor public viewing sessions, presentations, workshops, and other activities to increase public awareness about astronomy and our wonderful universe.

This fall, Astronomy Day will be held on October 12, 2021.

Conjunction of Mars & Moon

The planet Mars will appear in conjunction with the Moon in the western sky after sunset on this May 15, 2021.

International Day of Light

The International Day of Light is a global initiative that provides an annual focal point for the continued appreciation of light and the role it plays in science, culture and […]

St. Brendan, patron of navigators who steer by celestial bodies

Brendan of Clonfert (c. AD 484 – c. 577) Brénainn moccu Alti or Brénainn maccu Alti (Irish: Naomh Bréanainn or Naomh Breandán; Latin: Brendanus; Icelandic: (heilagur) Brandanus), also referred to as "Brendán moccu Altae" (Brendan of the Fosterling Folk), called "the Navigator", […]

World Telecommunication and Information Society Day

Theme: "Accelerating Digital Transformation in challenging times​"​. ​​ World Telecommunication and Information Society Day ​(WTISD) has been celebrated annually every 17 May since 1969 to mark the founding of ITU […]

First Quarter Moon

The Moon is at First Quarter on May 19th - it is visible high in the southern sky in early evening.

Andrei Sakharov, Nobel Laureate (b. 1921)

Andrei Dmitrievich Sakharov (21 May 1921 – 14 December 1989) was a Soviet and Russian nuclear physicist, dissident, Nobel laureate, and activist for disarmament, peace and human rights. He became renowned as the designer […]

Towel Day

Towel Day is an annual celebration on the 25th of May, as a tribute to the late author Douglas Adams (1952-2001). On that day, fans around the universe carry a towel […]

Moon at Perigee

The Moon is at perigee, its closest point to Earth in its monthly orbit, on May 25th.