This Day In History
Monday, June 21, 2021
On This Day


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in 1610

Galileo Galilei makes his...
Galileo Galilei makes his first observation of the four Galilean moons : Ganymede, Callisto, Io and Europa, although he is not able istinguish the last two until the following day. The Galilean moons are the four moons of Jupiter discovered by Galileo Galilei in January 1610. They are the largest of the many moons of Jupiter and derive their names from the lovers of Zeus: Io, Europa, Ganymede and Callisto. Ganymede, Europa and Io participate in a 1:2:4 orbital resonance. They are among the most massive objects in the Solar System outside the Sun and the eight planets, with radii larger than any of the dwarf planets.
Galileo, Jupiter, Ganymede, Callisto, Io, Europa

in 1904

The distress signal "CQD" is established only to be replaced two years later by "SOS". CQD, transmitted in Morse code as -.-. --.- -.. is one of the first distress signals adopted for radio use. It was announced on January 7, 1904, by "Circular 57" of the Marconi International Marine Communication Company, and became effective, for Marconi installations, beginning February 1, 1904.
distress signal, CQD, SOS

in 1960

The Polaris missile is...
The Polaris missile is test launched. The Polaris missile was a two-stage solid-fuel nuclear-armed submarine-launched ballistic missile (SLBM) built during the Cold War by Lockheed Corporation of California for the United States Navy. It was designed to be used as part of the Navy's contribution to the United States arsenal of nuclear weapons, replacing the Regulus cruise missile. Known as a Fleet Ballistic Missile (FBM), the Polaris was first launched from the Cape Canaveral, Florida, missile test base on January 7, 1960.
Polaris, missile, nuclear-armed


in 1800
Millard Fillmore

Millard Fillmore was the 13th President of the United States (1850–1853) and the last member of the Whig Party to hold the office of president. As Zachary Taylor's Vice President, he assumed the presidency after Taylor's death.
in 1964
Nicolas Cage

Nicolas Cage is an American actor, producer and director, having appeared in over 60 films.


in 1943
Nikola Tesla

Nikola Tesla was a Serbian-American inventor, mechanical engineer, and electrical engineer. He was an important contributor to the birth of commercial electricity, and is best known for developing the modern alternating current (AC) electrical supply system.
in 1989

Hirohito was the 124th Emperor of Japan according to the traditional order, reigning from December 25, 1926, until his death in 1989. Although better known outside of Japan by his personal name Hirohito, in Japan he is now referred to exclusively by his posthumous name Emperor Shōwa. The word Shōwa is the name of the era that corresponded with the Emperor's reign, and was made the Emperor's own name upon his death.
in 1998
Vladimir Prelog

Vladimir Prelog was a Croatian chemist and Nobel Prize winner in chemistry. Prelog lived and worked in Prague, Zagreb and Zürich during his lifetime.
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