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The International Cloud Atlas or simply the Cloud Atlas, is a cloud atlas that was first published in 1896 [1] and has remained in print since. Its initial purposes included aiding the training of meteorologists and promoting more consistent use of vocabulary describing clouds , which were both important for early weather forecasting .
An example of a Cloud Atlas. A cloud atlas is a pictorial key (or an atlas) to the nomenclature of clouds.Early cloud atlases were an important element in the training of meteorologists and in weather forecasting, and the author of a 1923 atlas stated that "increasing use of the air as a means of transportation will require and lead to a detailed knowledge of all the secrets of cloud building."
A time-lapse of comet C/2023 A3 (Tsuchinshan–ATLAS) captured on 10 May 2024. By January 2024, the comet had brightened to an apparent magnitude of 13.6 and according to Bob King, author in Sky & Telescope magazine, was visible through 15-inch telescopes at ×142 magnification. [10]
The comet had been suggested in 1911 to be the return of comet C/1790 A1 (Herschel), also known by its old designation, 1790 I. [1] [7] However, further calculations revealed that the orbit of comet Kiess had an eccentricity too high for an orbital period of 122 years, with the orbit calculated by Louis Lindsey in 1932 indicating an orbital ...
C/2024 G3 (ATLAS) is a partially disintegrated non-periodic comet, which reached perihelion on 13 January 2025, at a distance of 0.09 AU (13 million km) from the Sun. Dubbed the Great Comet of 2025 , it is currently the brightest comet of 2025, [ 6 ] with an apparent magnitude reaching −3.8 on the day of its perihelion. [ 5 ]
273P/Pons–Gambart, also called Comet Pons-Gambart, is a periodic comet in a retrograde orbit first discovered on June 21, 1827 by Jean-Louis Pons and Jean-Félix Adolphe Gambart. [3] It has a 186 year orbit and it fits the classical definition of a Halley-type comet (20 years < period < 200 years).
C/2024 L5 (ATLAS) is a comet that was discovered on 14 June 2024 as A117uUD by the Asteroid Terrestrial-impact Last Alert System (ATLAS), South Africa, Sutherland. It will reach perihelion on 10 March 2025 at 3.432 AU (513.4 million km ) from the Sun. [ 4 ] [ 5 ]
By definition, a hyperbolic orbit means that the comet will only travel through the Solar System once, with the Sun acting as a gravitational slingshot, sending the comet hurtling out of the Solar System entirely unless its eccentricity is otherwise changed. Comets orbiting in this way still originate from the Solar System, however.