• Tuesday

    Sunday

    — Center For Inquiry (CFI),
    Worldwide
    Various science and astronomy-related events to be held worldwide, such as star parties, lectures and viewings of his show Cosmos. ...

    Tuesday

  • Monday

    — Halley’s Comet,
    Worldwide
    One of 2 showers yearly from Halley’s Comet dust, one dust cloud from Halley's path toward the Sun, and one ...

    Wednesday

    — Comet 21P / Giacobini-Zinner,
    Worldwide
    Appearing when Earth passes through the tail of Comet 21P / Giacobini-Zinner, the comet was a perihelion in 2025; speculation ...

    Saturday

    — World Space Week Association,
    Celebrating international contributions of space science for betterment of the human condition; Oct 4 is 68th observation of 1st Space ...
    — International Observe the Moon Night Organization,
    Worldwide
    For observation, appreciation, understanding of the Moon / its connection to planetary science / exploration; 1st quarter Moon is best ...
    — National Aeronautics and Space Administration (NASA), Indian Space Research Organisation (ISRO), Japan Aerospace Exploration Agency (JAXA), European Space Agency (ESA), Australian Space Agency (ASA), Canadian Space Agency (CSA-ASC), Italian Space Agency (ASI), others,
    Worldwide
    48-hour hackathon in French and English for space enthusiasts, programmers, designers, engineers, entrepreneurs and students; 2800+ local events and online
  • Saturday

    — The Astronomical League,
    Worldwide
    Astronomical societies, planetariums, museums and observatories sponsor public viewing sessions, presentations and workshops.

    Monday

    — Sun-Earth,
    Worldwide
    The Sun rises exactly in east traveling through sky for 12 hours, sets exactly in west; every place on Earth ...
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