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  • Full Moon

    Full Moon

    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.

  • New Moon

    New Moon 2025

    New Moon. By the modern definition, New Moon occurs when the Moon and Sun are at the same geocentric ecliptic longitude. The part of the Moon facing us is completely in shadow then. Pictured here is the traditional New Moon, the earliest visible waxing crescent, which signals the start of a new month in many […]

  • Winter Solstice

    The winter solstice, also called the hibernal solstice, occurs when either of Earth's poles reaches its maximum tilt away from the Sun.

  • Ursids Meteor Shower

    The Ursids peak just before Christmas with rates of 5-10 meteors per hour during the late morning hours.

  • Mercury at Aphelion

    Mercury's 88-day orbit around the Sun will carry it to its furthest point to the Sun – its aphelion – at a distance of 0.47 AU.

  • Earth at Perihelion

    Earth will be at the closest point in its orbit around the Sun on this date - 91,403,034 miles.

  • Anniversary of the 2013 Chelyabinsk Asteroid Impact Event

    On February 15 2013 an asteroid exploded in the sky over the city of Chelyabinsk, in the the southern Ural region of Russia. The shock wave blew out windows all over the city, injuring over 1600 people, and damaged several buildings.

  • Summer Solstice

    The summer solstice is the day when the Sun appears to reach its highest point in the sky during the year - it marks the start of summer in the Northern Hemisphere.

  • International Asteroid Day

    International Asteroid Day is a United Nations-recognized day observed each year on the anniversary of the Tunguska impact event of June 30, 1908.

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