Mercury at Perihelion
Mercury's 88-day orbit around the Sun will carry it to its closest point to the Sun – its perihelion – at a distance of 0.31 AU from the Sun.
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Astronomical Events
Calendar of Events
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Moon at Perigee
Supermoon: Full Moon at the Moon's perigee - the Moon's closest point to Earth in its monthly orbit.
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Conjunction of Uranus & the Sun
Uranus will pass close to the Sun in the sky as its orbit carries it around the far side of the solar system from the Earth.
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Last Quarter Moon
The Moon is at Last Quarter (or Third Quarter) - rising around midnight, and visible to the south after sunrise.
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Eta-Aquariid Meteor Shower
The Eta Aquariids are a strong shower when viewed from the southern tropics. From the equator northward, they usually only produce medium rates of 10-30 per hour just before dawn. Activity is good for a week centered the night of maximum activity. These are swift meteors that produce a high percentage of persistent trains, but […]
Conjunction Moon and Jupiter
The Moon appears near the planet Jupiter in the southeastern predawn sky on this date.
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Moon at Apogee
The Moon’s distance from Earth varies throughout its monthly orbit because the Moon’s orbit isn’t perfectly circular. Every month, the Moon’s eccentric orbit carries it to apogee – its most distant point from Earth – and then, some two weeks later, to perigee – the Moon’s closest point to Earth in its monthly orbit. - earthsky.org
New Moon
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 […]
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Astronomy Day
Astronomy Day is an international event observed each fall and spring near the first quarter Moon. Local astronomical societies, planetariums, museums, and observatories sponsor public viewing sessions, presentations, workshops, and other activities to increase public awareness about astronomy and our wonderful universe.
Conjunction of Mars & Moon
The planet Mars will appear in conjunction with the Moon in the western sky after sunset on this May 15, 2021.
Astronomy Day
Astronomy Day is an international event observed each fall and spring near the first quarter Moon. Local astronomical societies, planetariums, museums, and observatories sponsor public viewing sessions, presentations, workshops, and other activities to increase public awareness about astronomy and our wonderful universe.
This fall, Astronomy Day will be held on October 12, 2021.
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Mercury at Greatest Elongation
Mercury swings to its greatest elongation east of the setting sun on May 17, 2021 (evening of May 16 for the Americas).
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First Quarter Moon
The Moon is at First Quarter on May 19th - it is visible high in the southern sky in early evening.
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Moon at Perigee
The Moon is at perigee, its closest point to Earth in its monthly orbit, on May 25th.
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Full Moon
The Full Moon rises at sunset, is visible all night, and is high in the sky around midnight. May's Full Moon is called the Flower Moon by The Old Farmer’s Almanac.
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Conjunction of Mercury and Venus
Mercury and Venus appear less than 1 degree apart at dusk on May 28th.
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Last Quarter Moon
The Moon is at Last Quarter (or Third Quarter) – rising around midnight, and visible to the south after sunrise.