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 […]


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 […]


Last Quarter Moon

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


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 […]

D-Day Remembrance

During World War II (1939-1945), the Battle of Normandy, which lasted from June 1944 to August 1944, resulted in the Allied liberation of Western Europe from Nazi Germany’s control. Codenamed […]