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A list of notable or rare observable astronomical events in the 21st and 22nd centuries, such as solar and lunar eclipses, planetary alignments, and asteroid approaches. Find out when and where to see these cosmic phenomena and what they mean for science and culture.
A sky chart showing where Mercury, Mars, Jupiter, Uranus, Neptune and Saturn will appear in the early morning sky during the first part of September. (Ac Planetary parade: See 6 planets in ...
A great conjunction is a rare event when Jupiter and Saturn appear very close together in the sky. Learn about the celestial mechanics, historical significance, and recent occurrences of this phenomenon, such as the 2020 conjunction with Io and Ganymede.
Learn about the history and methods of observing and studying Venus, the brightest planet in the sky. Find out how Venus shows phases, transits, and phases, and how spacecraft have explored its atmosphere and surface.
With a full moon on 5 February, experts say the darker evening hours before moonrise in the coming days will be the best bet for spotting it in the sky. How to track green comet over the week 07: ...
A classical planet is a visible astronomical object that moves across the sky relative to the fixed stars. Learn about the origin, names, symbols, and associations of the seven classical planets in different cultures and traditions.
Betelgeuse is a red supergiant star in the constellation of Orion, with a variable apparent magnitude ranging from +0.0 to +1.6. It is one of the brightest stars in the night sky, but it dimmed significantly in 2020 and 2023 due to a change in extinction.
A syzygy is a straight-line configuration of three or more celestial bodies in a gravitational system. Learn about the types, consequences, and examples of syzygies, such as eclipses, occultations, transits, and planetary alignments.