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.


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 […]

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.

Full Moon

The Full Moon rises at sunset, is visible all night, and is high in the sky around midnight. May's Full Moon is called the Flower Moon by The Old Farmer’s […]