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 […]
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 […]
Mercury swings to its greatest elongation east of the setting sun on May 17, 2021 (evening of May 16 for the Americas).
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", […]
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 […]
The Moon is at First Quarter on May 19th - it is visible high in the southern sky in early evening.
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 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 […]
The Moon is at perigee, its closest point to Earth in its monthly orbit, on May 25th.
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 […]
A Total Lunar Eclipse occurs on this night
Mercury and Venus appear less than 1 degree apart at dusk on May 28th.