datum
101datum line — noun A fixed, measurable line, used as a reference from which angular or linear measurements are taken …
102datum circle — noun The circle in which a measurement is taken. Generally used when measuring the tooth of a gear …
103datum point — noun A point which serves as a reference or base for the measurement of other quantities …
104datum plane — noun A plane from which angular or linear measurements are reckoned. Syn: reference plane …
105datum plane — A reference level to which topographic or water levels in wells are related [16] …
106datum level — n. level from which heights and depths are measured …
107datum plane — n. level from which heights and depths are measured …
108datum point — n. point from which heights and depths are measured (Engineering, Surveying) …
109datum surface — n. level from which heights and depths are measured …
110Julianisches Datum — Das Julianische Datum – nicht mit dem Datum im Julianischen Kalender zu verwechseln – gibt die Zeit in Tagen an, die seit dem 1. Januar −4712 (4713 v. Chr.) 12:00 Uhr vergangen ist. Dem Datum Donnerstag, der 13. Oktober 2011,… …