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  2. CalSky - Wikipedia

    en.wikipedia.org/wiki/CalSky

    CalSky (sky calendar) was a web-based astronomical calculator used by astronomers to plan observing. It was created by Arnold Barmettler, a researcher at the University of Zurich and formerly a scientific assistant at the European Space Agency. [1] The website, available in English and German, featured a calendar (and/or email notifications ...

  3. List of astronomy websites - Wikipedia

    en.wikipedia.org/wiki/List_of_astronomy_websites

    CalSky (sky calendar) was web based astronomical calculator used by astronomers to plan observing. It was created by Arnold Barmettler a researcher at the University of Zurich and formerly a scientific assistant at the European Space Agency. [3]

  4. List of satellite pass predictors - Wikipedia

    en.wikipedia.org/wiki/List_of_satellite_pass...

    CalSky a service offered by Arnold Barmettler for astronomers to plan their observing sessions. Features a calendar (and/or email notifications) generated for your location including information on aurora, comets, tides, solar and lunar eclipses, planets, bright satellite passes (ISS, HST, etc.), occultations, transits, Iridium flares , and ...

  5. 2024–25 United States network television schedule - Wikipedia

    en.wikipedia.org/wiki/2024–25_United_States...

    Light blue indicates local programming. Gray indicates encore programming. Blue-gray indicates news programming. Light green indicates sporting events. Red indicates series being burned off and other irregularly scheduled programs, including specials and movies.

  6. Hanke–Henry Permanent Calendar - Wikipedia

    en.wikipedia.org/wiki/Hanke–Henry_Permanent...

    Hanke–Henry Permanent Calendar pre-2016 version with weeks still starting Sunday, but Xtra already at the end of the year. In 2004, Richard Conn Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time (CCC&T), which he described as a modification to a proposal by Robert McClenon.

  7. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The history of calendars covers practices with ancient roots as people created and used various methods to keep track of days and larger divisions of time. Calendars commonly serve both cultural and practical purposes and are often connected to astronomy and agriculture. Archeologists have reconstructed methods of timekeeping that go back to ...

  8. List of space programs of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_space_programs_of...

    From crewed space exploration and the Apollo 11 landing on the Moon, to the Space Shuttle, International Space Station, Voyager, the Mars rovers, numerous space telescopes, and the Artemis program, NASA delivers on the civil space exploration mandate. NASA also cooperates with other U.S. civil agencies such as the National Oceanic and ...

  9. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    Gregorian calendar. The Gregorian calendar is the calendar used in most parts of the world. [1][a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years ...