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Des Plaines (/ d ɪ s ˈ p l eɪ n z /) is a city in Cook County, Illinois, United States.Per the 2020 census, the population was 60,675. [4] The city is a suburb of Chicago and is located just north of O'Hare International Airport.
The equatorial describes the sky as seen from the Solar System, and modern star maps almost exclusively use equatorial coordinates. The equatorial system is the normal coordinate system for most professional and many amateur astronomers having an equatorial mount that follows the movement of the sky during the night. Celestial objects are found ...
The city lies within the Sidlaw-Ochil anticline, and the predominant bedrock type is Old Red Sandstone of the Arbuthnott-Garvock group. [77] Differential weathering of a series of igneous intrusions has yielded a number of prominent hills in the landscape, most notably the Dundee Law (a late Silurian /early Devonian Mafic rock intrusion) and ...