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An astronomical instrument is a device for observing, measuring, or recording astronomical data. [ citation needed ] They are used in the scientific field of astronomy , a natural science that studies celestial objects and the phenomena that occur in the cosmos, with the object of explaining their origin and evolution over time.
The solar azimuth angle is the azimuth (horizontal angle with respect to north) of the Sun's position. [1] [2] [3] This horizontal coordinate defines the Sun's relative direction along the local horizon, whereas the solar zenith angle (or its complementary angle solar elevation) defines the Sun's apparent altitude.
Near the horizon, atmospheric refraction causes sunlight rays to be distorted to such an extent that geometrically the solar disk is already about one diameter below the horizon when a sunset is observed. Sunset over the Delaware Bay at Sunset Beach, New Jersey, U.S., seen through cirrus clouds
A simple alidade for use with a ceiling projector. An alidade (/ ˈ æ. l ɪ. d eɪ d /) (archaic forms include alhidade, alhidad, alidad) [citation needed] or a turning board is a device that allows one to sight a distant object and use the line of sight to perform a task.
Easy to use monthly star maps for northern and southern hemispheres. Helpful target lists for naked eye, binocular, or telescope viewing. Collection of rare star atlases, charts, and maps Archived 2018-03-25 at the Wayback Machine available in full digital facsimile at Linda Hall Library. Navigable online map of the stars, Stellarmap.com.
Israel wasted no time after Bashar al-Assad’s fall to bomb all the Syrian military assets it wanted to keep out of the rebels’ hands – striking nearly 500 targets, destroying the navy, and ...
A weather station is a facility with instruments and equipment to make observations of atmospheric conditions in order to provide information to make weather forecasts and to study the weather and climate. The measurements taken include temperature, barometric pressure, humidity, wind speed, wind direction, and precipitation amounts.
During a Communist Party meeting earlier this month, Cuban leader Miguel Díaz-Canel blamed U.S. sanctions -- the government’s favorite whipping boy -- for the crisis.