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  • Tullio Levi-Civita, born 1873

    Tullio Levi-Civita, ForMemRS (English: /ˈtʊlioʊ ˈlɛvi ˈtʃɪvɪtə/, Italian: ; 29 March 1873 – 29 December 1941) was an Italian mathematician, most famous for his work on absolute differential calculus (tensor calculus) and its applications to the theory of relativity, but who also made significant contributions in other areas. He was a pupil of Gregorio Ricci-Curbastro, the inventor of tensor calculus. His work included foundational papers in both pure and applied […]

  • Francesco Zantedeschi died 1873

    Francesco Zantedeschi (August 20, 1797 – March 29, 1873) was an Italian Catholic priest and physicist. A native of Dolcè, near Verona, Zantedeschi was for some time professor of physics and philosophy in the Liceo of Venice. Later he accepted the chair of physics in the University of Padua, which he held until 1853 being then obliged to resign on account of failing sight. He was an […]

  • Cesar Chavez Day, born 1927, Yuma, AZ.

    Cesar Chavez (born César Estrada Chávez, locally ; March 31, 1927 – April 23, 1993) was an American labor leader and Latino American civil rights activist. Along with Dolores Huerta, he co-founded the National Farm Workers Association, later renamed the United Farm Workers (UFW) union. - Wikipedia

  • April Fools Day.

    April Fools' Day or April Fool's Day (sometimes called All Fools' Day) is an annual celebration on April 1, commemorated by practical jokes and hoaxes. The player(s) of the joke(s) or hoax(es) often exposes their action by shouting "April fool(s)" at the recipient(s). The recipient of these actions are called April fools. Mass media can be involved in these pranks that the following […]

  • Full Moon

    Full Moon 2026

    Full Moon 2026

    The Full Moon rises at sunset, and is visible all night. The Vatican Observatory's monthly Full Moon Meetup for Sacred Space Astronomy subscribers is held at 10:00 AM Tucson time.

  • International Day of Human Space Flight.

    The General Assembly, in its resolution A/RES/65/271 of 7 April 2011, declared 12 April as the International Day of Human Space Flight “to celebrate each year at the international level the beginning […]

  • The Pope’s Astronomer: Lessons from a Decade Leading the Vatican Observatory

    Moderator Dr. Kirsten M. Ellenbogen has a conversation with Brother Guy Consolmagno. When: Friday, April 17, 2026 - 11:30 a.m. - 1:00 p.m. Doors at 11:15am / Lunch at 11:30am / Forum begins 12:00pm Where: The City Club of Cleveland 1317 Euclid Avenue, Suite 100 Cleveland, OH 44115 More info and tickets here.

  • J. A. Fleming died, 1945 (b. 1849).

    Illustration from the Bibliographical Memoirs of Fellows of the Royal Society, 1945. The Royal Society, London. Sir John Ambrose Fleming FRS died in 1945, aged 95 (born 29 November 1849). "He was an English electrical engineer and physicist who invented the first thermionic valve or vacuum tube, designed the radio transmitter with which the first […]

  • International Earth Day

    First held in 1970, Earth Day is held annually on April 22 to demonstrate support for environmental protection.

  • International Chernobyl Disaster Remembrance Day

    An explosion at the Chernobyl Nuclear Power Plant in 1986 spread a radioactive cloud over large parts of the Soviet Union; millions of people in the three countries were exposed to the radiation.

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