Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > Mapping science

cardan suspension

Earth science; Mapping science

A Cardan coupling connecting a suspended object and a supporting framework. Cardan suspensions are used to keep instruments level regardless of the motion of the supports, e.g., ...

bz

Earth science; Mapping science

The z-component of the representation, in a photogrammetric model, of the air base the line joining two camera stations.

Bureau International Des Points And Mesures (BIPM)

Earth science; Mapping science

The BIPM was established in 1875 in accordance with the Convention du Metre. In 1988, it took over, from the Bureau International de l'Heure, the responsibility for establishing ...

astronomical clock

Earth science; Mapping science

(1) A clock whose indicated time is determined by the rotation or revolution of the Earth. (2) The rotation or revolution of the Earth, considered as a timekeeping mechanism.

eccentric compass

Earth science; Mapping science

A compass having the line of sight deliberately placed tangent to the rim of the compass.

instrument circle

Earth science; Mapping science

(1) A telescope having motion only about a horizontal axis. e.g., a meridian circle is a telescope having movement only in the plane of the meridian. (2) A circular disk or ...