Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, Pi’s infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits.

What Is Pi In Math?
Pi (π) is the ratio of a circle’s circumference to its diameter. Pi is a constant number, meaning that for all circles of any size, Pi will be the same.
The diameter of a circle is the distance from edge to edge, measuring straight through the center. The circumference of a circle is the distance around.  
History of Pi
By measuring circular objects, it has always turned out that a circle is a little more than 3 times its width around. In the Old Testament of the Bible (1 Kings 7:23), a circular pool is referred to as being 30 cubits around, and 10 cubits across. The mathematician Archimedes used polygons with many sides to approximate circles and determined that Pi was approximately 22/7. The symbol (Greek letter π) was first used in 1706 by William Jones. A ‘p’ was chosen for ‘perimeter’ of circles, and the use of π became popular after it was adopted by the Swiss mathematician Leonhard Euler in 1737. In recent years, Pi has been calculated to over one trillion digits past its decimal. Only 39 digits past the decimal are needed to accurately calculate the spherical volume of our entire universe, but because of Pi’s infinite & patternless nature, it’s a fun challenge to memorize, and to computationally calculate more and more digits.

Geometry (Geometry Calculators)
The number pi is extremely useful when solving geometry problems involving circles. Here are some examples:
The area of a circle (Area of a circle calculator).
A = πr2
Where ‘r’ is the radius (distance from the center to the edge of the circle). Also, this formula is the origin of the joke “Pies aren’t square, they’re round!”

The volume of a cylinder (Volume calculator).
V = πr2h
To find the volume of a rectangular prism, you calculate length x width x height. In that case, length x width is the area of one side (the base), which is then multiplied by the height of the prism. Similarly, to find the volume of a cylinder, you calculate the area of the base (the area of the circle), then multiply that by the height (h) of the cylinder.
Last Updated on July 25th, 2018

Source: piday.org

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Standard time

Local mean solar time depends upon longitude; it is advanced by four minutes per degree eastward. In 1869 Charles F. Dowd, principal of a school in Saratoga Springs, N.Y., proposed the use of time zones, within which all localities would keep the same time. Others, including Sir Sandford Fleming, a Canadian civil engineer, strongly advocated this idea. Time zones were adopted by U.S. and Canadian railroads in 1883.

britannica.com

0483 – St. Felix III began his reign as Pope.

0607 – The 12th recorded passage of Halley’s Comet occurred.

1519 – Cortez landed in Mexico.

1639 – Harvard University was named for clergyman John Harvard.

1660 – A statute was passed limiting the sale of slaves in the colony of Virginia.

1777 – The U.S. Congress ordered its European envoys to appeal to high-ranking foreign officers to send troops to reinforce the American army.

1781 – Sir William Herschel discovered the planet Uranus.

1852 – The New York “Lantern” newspaper published the first “Uncle Sam cartoon”. It was drawn by Frank Henry Bellew.

1865 – Jefferson Davis signed a bill authorizing slaves to be used as soldiers for the Confederacy.

1868 – The U.S. Senate began the impeachment trial of President Andrew Johnson.

1877 – Chester Greenwood patented the earmuff.

1878 – The first collegiate golf match was played between Oxford and Cambridge.

1884 – Standard time was adopted throughout the U.S.

1900 – In South Africa, British Gen. Roberts took Bloemfontein.

1901 – Andrew Carnegie announced that he was retiring from business and that he would spend the rest of his days giving away his fortune. His net worth was estimated at $300 million.

1902 – In Poland, schools were shut down across the country when students refused to sing the Russian hymn “God Protect the Czar.”

1902 – Andrew Carnegie approved 40 applications from libraries for donations.

1908 – The people of Jerusalem saw an automobile for the first time. The owner was Charles Glidden of Boston.

1911 – The U.S. Supreme Court approved corporate tax law.

1915 – The Germans repelled a British expeditionary force attack in France.

1918 – Women were scheduled to march in the St. Patrick’s Day Parade in New York due to a shortage of men due to wartime.

1925 – A law in Tennessee prohibited the teaching of evolution.

1930 – It was announced that the planet Pluto had been discovered by scientist Clyde Tombaugh at the Lowell Observatory.

1933 – U.S. banks began to re-open after a “holiday” that had been declared by President Roosevelt.

1935 – Three-thousand-year-old archives were found in Jerusalem confirming some biblical history.

1940 – The war between Russia and Finland ended with the signing of a treaty in Moscow.

1941 – Adolf Hitler issued an edict calling for an invasion of the U.S.S.R.

1942 – Julia Flikke of the Nurse Corps became the first woman colonel in the U.S. Army.

1943 – Japanese forces ended their attack on the American troops on Hill 700 in Bougainville.

1946 – Reports from Iran indicated that Soviet tanks units were stationed 20 miles from Tehran.

1946 – Premier Tito seized wartime collaborator General Draja Mikhailovich in a cave in Yugoslavia.

1951 – Israel demanded $1.5 billion in German reparations for the cost of caring for war refugees.

1951 – The comic strip “Dennis the Menace” appeared for the first time in newspapers across the country.

1957 – Jimmy Hoffa was arrested by the FBI on bribery charges.

1963 – China invited Soviet President Khrushchev to visit Peking.

1969 – The Apollo 9 astronauts returned to Earth after the conclusion of a mission that included the successful testing of the Lunar Module.

1970 – Cambodia ordered Hanoi and Viet Cong troops to leave.

1970 – Digital Equipment Corp. introduced the PDP-11 minicomputer.

1972 – “The Merv Griffin Show” debuted in syndication for Metromedia Television.

1974 – The U.S. Senate voted 54-33 to restore the death penalty.

1974 – An embargo imposed by Arab oil-producing countries was lifted.

1980 – A jury in Winamac, IN, found Ford Motor Company innocent of reckless homicide in the deaths of three young women that had been riding in a Ford Pinto.

1988 – The board of trustees off Gallaudet University in Washington, DC, chose I. King Jordan to be its first deaf president. The college is a liberal arts college for the hearing-impaired.

1990 – The U.S. lifted economic sanctions against Nicaragua.

1991 – Exxon paid $1 billion in fines and for the clean-up of the Alaskan oil spill.

1995 – The first United Nations World Summit on Social Development concluded in Copenhagen, Denmark.

1997 – Sister Nirmala was chosen by India’s Missionaries of Charity to succeed Mother Teresa as leader of the Catholic order.

2002 – Fox aired “Celebrity Boxing.” Tonya Harding beat Paula Jones, Danny Banaduce beat Barry Williams and Todd Bridges defeated Vanilla Ice.

2003 – Japan sent a destroyer to the Sea of Japan amid reports that North Korea was planning to test an intermediate-range ballistic missile.

2003 – A report in the journal “Nature” reported that scientists had found 350,000-year-old human footprints in Italy. The 56 prints were made by three early, upright-walking humans that were descending the side of a volcano.

2006 – In New York, the official start of construction of the National September 11 Memorial & Museum began.

2012 – After 244 years of publication, Encyclopædia Britannica announced it would discontinue its print edition.

Upon hearing of England’s rejection of the so-called Olive Branch Petition on November 12, 1775, Abigail Adams writes to her husband, John, “Let us separate, they are unworthy to be our Brethren. Let us renounce them and instead of supplications as formerly for their prosperity …read more

Women’s History Month