Pi Day is an unofficial holiday commemorating the mathematical constant π (pi). Pi Day is celebrated on March 14 (or 3/14 in month/da y date format), since 3, 1 and 4 are the three most sig nificant digits of π in the decimal form. In 2009, the United States House of Representat ives supported the designation of Pi Day.[2]
Pi Approximation D ay is held on July 22 (or 22/7 in day/month date format), since the fraction 22⁄7 is a common app roximation of π.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Mole Day (October 23rd, 2026 at midnight) URL:http://www.DaysUntil.com/Mole-Day DTSTART;VALUE=DATE:20261023 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Mole-Day-00002026 DESCRIPTION:X-WR-CALDESC:Mole Day is an unoffic
ial holiday celebrated among chemists on October 23, between 6:02 AM an
d 6:02 PM,[1][2][3] making the date
6:02 10/23 in the American style of writing dates. The time and date are d
erived from Avogadro's number, which is a
pproximately 6.02×1023, defining the number of particles (
atoms or molecules) in one mole of substance, one of the seven base SI un
its.
Mole Day originated in an article in The Science Teacher
in the early 1980s.
Friday the 13th is a date considered to be bad luck in western superstition.
According to folklorists, there is no writ ten evidence for a "Friday the 13th" superstition before the 19th century.< sup id="cite_ref-Lachenmeyer_0-0" class="reference">[1]< /span>[2< span>][ 3] The earliest known documented reference in English occurs in Henry Sutherland Edwards' 1869 biography of Gioachino Rossini:
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:π (Pi) Day (March 14th, 2027 at midnight) URL:http://www.DaysUntil.com/Pi-Day DTSTART;VALUE=DATE:20270314 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Pi-Day-00002027 DESCRIPTION:X-WR-CALDESC:Pi Day is an unofficial holiday commemorating the mathematical constant π (pi). Pi Day is celebrated on March 14 (or 3/14 in month/da y date format), since 3, 1 and 4 are the three most sig nificant digits of π in the decimal form. In 2009, the United States House of Representat ives supported the designation of Pi Day.[2]
Pi Approximation D ay is held on July 22 (or 22/7 in day/month date format), since the fraction 22⁄7 is a common app roximation of π.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (6) (June 6th, 2036 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-6 DTSTART;VALUE=DATE:20360606 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-6-00002036 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (7) (July 7th, 2049 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-7 DTSTART;VALUE=DATE:20490707 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-7-00002049 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (8) (August 8th, 2064 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-8 DTSTART;VALUE=DATE:20640808 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-8-00002064 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (9) (September 9th, 2081 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-9 DTSTART;VALUE=DATE:20810909 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-9-00002081 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (1) (January 1st, 2101 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-1 DTSTART;VALUE=DATE:21010101 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-1-00002101 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (2) (February 2nd, 2104 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-2 DTSTART;VALUE=DATE:21040202 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-2-00002104 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (3) (March 3rd, 2109 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-3 DTSTART;VALUE=DATE:21090303 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-3-00002109 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (4) (April 4th, 2116 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-4 DTSTART;VALUE=DATE:21160404 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-4-00002116 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:Square Root Day (5) (May 5th, 2125 at midnight) URL:http://www.DaysUntil.com/Square-Root-Day-5 DTSTART;VALUE=DATE:21250505 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-Square-Root-Day-5-00002125 DESCRIPTION:X-WR-CALDESC:Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Squa re Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will b e April 4, 2016 (4/4/16). The final Square Root Day of the century will occ ur on September 9, 2081. Square Root Days fall upon the same nine dates eac h century.
Ron Gordon, a Redwood City, Californ ia high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook grou p where people can share how they were celebrating the day.[3]
END:VEVENT BEGIN:VEVENT DTSTAMP:20260611T025214Z CATEGORIES:Days Until CLASS:PUBLIC ORGANIZER:DaysUntil.com SUMMARY:the End of the World (March 25th, 2407 at sunset) URL:http://www.DaysUntil.com/End-Of-The-World-Mayan DTSTART;VALUE=DATE:24070326 DURATION:P1D TRANSP:TRANSPARENT UID:DaysUntil.com-End-Of-The-World-Mayan-00140000 DESCRIPTION:X-WR-CALDESC:Book of Revelation
Book of Daniel
Olivet discourse
Sheep and Goats
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b>Major figures
Jesus<
br>Two Witnesses
Four Horsemen
Antichrist
Different views
Preterism
Idealism
Historicism
Futurism
Millennial differe
nces
Premillennialism
Amillennialism
Postmillennialism
Other events
Chronology of Revelation
Rapture
Seven Seals
Jesus' Second Coming
Kalki
Kali Yuga
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END:VEVENT
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