Biologists have identified, for the first time, that mature reed warblers are able to detect the declination from magnetic north, and use the scale of the declination or change from true north to ...
The equatorial coordinate system projects Earth's latitude and longitude onto the celestial sphere, using declination (angular distance from the celestial equator, measured in degrees) and right ...
RECENT IMPROVEMENTS IN ASTRONOMICAL INSTRUMENTS.—Acting under the directions of the Secretary of the Navy, Prof. Newcomb last year visited the principal Observatories on the continent of Europe for ...
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