Monday Open Thread; August 21 is "The Great American Eclipse"

August 21 is the 233rd day of the year. There are 132 days left.

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Today's number is 21

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21 is the product of 2 primes, 7 and 3

21 is the sum of the first 6 natural numbers. 1+2+3+4+5+6 = 21 21 is a fibonnacci number 0,1,1,2,3,5,8,13,21 21st Amendment ended prohibition 21 is Scandium 21 is the total of the spots on one 6 sided die (see: sum of the first 6 natural numbers, duh) In several countries 21 is the legal age of majority. In all US states 21 is the legal drinking age. In some countries 21 is the voting age. The highest-winning point total in Blackjack is 21 There are 21 shillings in a guinea.

OK, 21 is 3 x 7. Accordingly, x/21, whenever x =3n, is the same as n/7 which gets us back to the freaky repeating decimal (0.142857) discussed on the 7th and the 14th. The decimal part of n/7 where n is a natural number not a multiple of 999,999 or 7 is the remainder x 0.142857 repeated on out to infinity. n/14 has similar rules, and now we get to n/21, which is, for example ...

1/21 = 0.047619047619 repeat == (1/7)/3 2/21 = 0.095238095238 repeat == (2/7)/3 3/21 = 0.142857142857 repeat == (3/7)/3 == 1/7, Bingo! 4/21 = 0.190476 repeat == (4/7)/3 etc.

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Title 21 of the US Code is Food And Drugs.

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21 BCE was the Year of the Consulship of Lollius and Lepidus

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21 CE was the  Year of the Consulship of Augustus and Caesar King Daeso of Dongbuyeo died in battle Arminius, who whupped that Damned Varus at the battle of Teutoburger Wald, died The Empress Wang died

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On this day in: 1680 – Pueblo Indians captured Santa Fe from the Spanish 1791 – The Haitian Revolution began. 1831 – Nat Turner led black slaves and free blacks in a rebellion 1852 – Tlingit Indians destroyed Fort Selkirk 1888 – The first successful adding machine in the US was patented 1945 – Harry Daghlian was fatally irradiated by the Demon core at Los Alamos 1959 – Ike signed an executive order proclaiming Hawaii to be the 50th state 1961 – Motown released "Please Mr. Postman" by The Marvelettes which became its first #1 hit. 1963 – The Army of the Republic of Vietnam vandalized Buddhist Pagodas, arrested thousands and killed hundreds 1971 – A Liberal Party rally in Manila, was bombed, injuring several anti-Marcos political candidates 1983 – Philippine opposition leader Benigno Aquino, Jr. was assassinated 1986 – Carbon dioxide gas erupted from Lake Nyos in Cameroon, killing up to 1,800 people 2017 – Great American Eclipse

Ooooh, eclipses, portents, omens, and all that

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Born this day in:

1665 – Giacomo F. Maraldi, astronomer and mathematician 1754 – William Murdoch, engineer and inventor 1789 – Augustin-Louis Cauchy, mathematician 1872 – Aubrey Beardsley, author and illustrator 1886 – Ruth Manning-Sanders, author and poet 1904 – Count Basie, pianist, composer and bandleader 1906 – Friz Freleng, animator and cartoonist 1928 – Art Farmer, played trumpet, flugelhorn and flumpet, also composer 1938 – Kenny Rogers, singer, songwriter and guitarist 1944 – Jackie DeShannon, singer and songwriter 1952 – Glenn Hughes, bassist, singer and songwriter 1952 – Joe Strummer, singer, songwriter and guitarist, co-founded The Clash 1973 – Sergey Brin, computer scientist, co-founder of Google

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Died this day in:

1614 – Elizabeth Bathory, countess, extremely prolific serial killer 1836 – Claude-Louis Navier, engineer and physicist 1940 – Ernest Thayer, writer and poet, wrote "Casey at the Bat". 1940 – Leon Trotsky, died from the wound he suffered on the 20th 1947 – Ettore Bugatti, engineer 1960 – David B. Steinman, engineer who designed the Mackinac Bridge 1971 – George Jackson, activist and author 1988 – Ray Eames, architect and designer 1989 – Raul Seixas, singer and songwriter 1995 – Subrahmanyan Chandrasekhar, astrophysicist and mathematician 2005 – Robert Moog, engineer and inventor

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Holidays, Holy Days, Festivals, Feast Days and such:                                           Ninoy Aquino Day (Philippines)

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So, for music

Count Basie

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Art Farmer

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Kenny Rogers

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Jackie DeShannon

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Glen Hughes

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Joe Strummer

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Raul Seixas

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Subrahmanyan Chandrasekhar, who predicted the existence of black holes

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Robert Moog

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Bonus:

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Crossposted from http://caucus99percent.com