April 30 is the 120th day of the year, there are 245 days left
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Setting Orange, Discord 47, 3184 YOLD
(for the discordians amongst us)

Today's number is 30

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30 is
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30 is the sum of the first four square numbers: 1+4+9+16
30 = 5 x 6; half of the base for the decimal system x half of the base for the duodecimal system = half of the base for the Sexagesimal system (Sumeria, Babylonia). Distributive law at work. There is a lot here but I won't get into it.
30 is zinc
30 is reporter and editor code for end of story
30 is the minimum age to be a US Sentor

30 seconds over Tokyo was a book about the World War II "Doolittle Raid" written by Major Ted William Lawson which was also made into a movie

M30 is a globular cluster in the constellation Capricorn

There were 30 uprights in Stonhenge's Sarsen Circle

There are 30 variations in Bach's Goldgerg Variations

.30 caliber was both a machine gun and a carabine used by the US military

.30-30 and .30-06 were historically significant weapons (a carabine & a rifle)

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Title 30 of the US Code isMINERAL LANDS AND MINING

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30 BCE
was the Year of the Consulship of Octavian and Crassus
Gaius Julius Caesar Octavian, aka Augustus, became Roman Consul for the fourth time, captured Alexandria and annexed Ancient Egypt to the Roman Republic.
Cleopatra comitted suicide and Ptolemy XV Caesarion was executed, which ended the Ptolemaic dynasty, the last dynasty of Ancient Egypt.
Mark Antony, Cleopatra VII, Ptolemy Caesar, Marcus Antonius Antyllus, and Hyrcanus II, king of Judea all died.
Eventual king of the Marcomanni, Maroboduus, was born.

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30 CE was the Year of the Consulship of Vinicius and Longinus
Phaedrus translated Aesop's fables
Nerva, an eventual Roman Emperor, and Poppaea Sabina were born
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On this day in:

1492 -- Spain gave Columbus a commission of exploration.
1598 -- Juan de Onate made a formal declaration of his Conquest of New Mexico.
1598 -- Henry IV issued the Edict of Nantes
1789 -- Washington took the oath of office as President of the US
1838 -- Nicaragua bailed on the Central American Federation.
1871 -- The Camp Grant massacre went down
1897 -- J. J. Thomson announced his discovery of the electron
1900 -- Hawaii was made a US territory ruled by Sanford B. Dole
1904 -- The Saint Louis World's Fair opened, Louis
1905 -- Albert Einstein wrote his thesis - "A New Determination of Molecular Dimensions".
1927 -- The first federal prison for women opened, in W. WA.
1939 -- The 1939-40 New York World's Fair opened
1945 -- Hitler committed suicide
1945 -- Soviet troops liberated Stalag Luft I releasing roughly 9000 US and British airmen.
1948 -- The OAS was formed
1963 -- The Bristol Bus Boycott took place
1966 -- The Church of Satan was formed
1975 -- Saigon fell and Duong Van Minh officially surrendered
1993 -- CERN announced that Web protocols would be free
2004 -- U.S. media released photos US troops abusing Iraqi prisoners at Abu Ghraib, military and government officials feigned shock and surprise

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Born this day in:

1777 -- Carl Friedrich Gauss, mathematician and physicist
1866 -- Mary Haviland Stilwell Kuesel, dentist
1877 -- Alice B. Toklas, memoir writer, cookbook author
1896 -- Reverend Gary Davis, singer and guitarist
1910 -- Levi Celerio, pianist, violinist, and composer
1916 -- Robert Shaw, conductor
1917 -- Bea Wain, singer
1921 -- Roger L. Easton, co-inventor of the GPS
1923 -- Percy Heath, bassist
1925 -- Johnny Horton, singer, songwriter, and guitarist
1934 -- Jerry Lordan, singer and songwriter
1938 -- Larry Niven, author and screenwriter
1943 -- Bobby Vee, pop singer and songwriter
1945 -- Mimi Farin±a, singer, songwriter, guitarist, and activist
1947 -- Finn Kalvik, guitarist, singer, and songwriter
1948 -- Wayne Kramer, singer, guitarist and songwriter
1953 -- Merrill Osmond, singer, bassist and Osmond
1969 -- Paulo Jr., bass player
1976 -- Amanda Palmer, singer, songwriter, and pianist
1981 -- Justin Vernon, multi-instrumentalist, singer and songwriter
1982 -- Drew Seeley, singer, songwriter and dancer

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Died this day in:

0065 -- Lucan, poet
1883 -- Edouard Manet, painter
1900 -- Casey Jones, engineer
1936 -- A. E. Housman, poet
1945 -- Adolf Hitler, nazi
1983 -- Muddy Waters, singer, songwriter, guitarist, bandleader, seminal chicago bluesman
1989 -- Sergio Leone, director, producer, and screenwriter
2016 -- Daniel Berrigan, peacenik, activist and priest

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Holidays, Holy Days, Festivals, Feast Days and such:
International Jazz Day
Global Day of Prayer (Western Christianity, US Congress)
Beltane (North)
Samhain (South)
Walpurgis Night

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Reverend Gary Davis

Percy Heath

Johnny Horton

Bobby Vee

Mimi Farina

Amanda Palmer

Casey Jones

Uncle Muddy

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picture Portrait of Billie Holiday and Mister, Downbeat, New York, N.Y., ca. Feb. 1947] (LOC); Gottlieb, William P., 1917-, photographer.; Library of Congress

It's an open thread, so do your thing