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Messier 99 or M99, also known as NGC 4254 or St. Catherine's Wheel, is a grand design spiral galaxy in the northern constellation Coma Berenices approximately 15,000,000 parsecs (49,000,000 light-years) from the Milky Way. [5] It was discovered by Pierre Méchain on 17 March 1781.
In Greek antiquity the ideas of celestial spheres and rings first appeared in the cosmology of Anaximander in the early 6th century BC. [7] In his cosmology both the Sun and Moon are circular open vents in tubular rings of fire enclosed in tubes of condensed air; these rings constitute the rims of rotating chariot-like wheels pivoting on the Earth at their centre.
This project was originally formed to coordinate editors' efforts on creating articles related to astronomical objects.The project's original members worked together to develop a category hierarchy and a series of templates, including information boxes, that could be used to improve the articles' appearance and navigability.
Messier 36 or M36, also known as NGC 1960 or the Pinwheel Cluster, is an open cluster of stars in the somewhat northern Auriga constellation.It was discovered by Giovanni Batista Hodierna before 1654, who described it as a nebulous patch. [5]
In astronomy, a planisphere (/ ˈ p l eɪ. n ɪ ˌ s f ɪər, ˈ p l æ n. ɪ-/) is a star chart analog computing instrument in the form of two adjustable disks that rotate on a common pivot. It can be adjusted to display the visible stars for any time and date.
A volvelle or wheel chart is a type of slide chart, a paper construction with rotating parts. It is considered an early example of a paper analog computer. [1] Volvelles have been produced to accommodate organization and calculation in many diverse subjects. Early examples of volvelles are found in the pages of astronomy books.
SkyStar Wheel is a 150-foot tall (45.7 m) 137-foot (41.8 m) diameter traveling observation wheel located in San Francisco's Fisherman's Wharf since November 13, 2023. It has previously operated in San Francisco's Music Concourse (2020–2023), Cincinnati 's The Banks (2018–2020), Louisville 's Waterfront Park (2018), and Norfolk (2018).
A deep-sky object (DSO) is any astronomical object that is not an individual star or Solar System object (such as Sun, Moon, planet, comet, etc.). [1] [2] The classification is used for the most part by amateur astronomers to denote visually observed faint naked eye and telescopic objects such as star clusters, nebulae and galaxies. This ...