F Datum

Kann diese Beziehung funktionieren? Love Datum f first time

Bildquelle ⇑

Bildquelle ⇑

Bildquelle ⇑

This predicate can be used to distinguish syntax object s in an expanded expression that were directly present in the original expression, as opposed to syntax object s inserted by macros. The hidden property to represent original syntax is dropped for a syntax object that is marshaled as part of compiled code; see also current-compile. A syntax pair is a pair containing a syntax object as its first element, and either the empty list, a syntax pair, or a syntax object as its second element.

Bildquelle ⇑

A geodetic datum or geodetic system is a coordinate system , and a set of reference points, used to locate places on the Earth or similar objects. An approximate definition of sea level is the datum WGS 84 , an ellipsoid , whereas a more accurate definition is Earth Gravitational Model EGM , using at least 2, spherical harmonics. Other datums are defined for other areas or at other times; ED50 was defined in over Europe and differs from WGS 84 by a few hundred meters depending on where in Europe you look. Mars has no oceans and so no sea level, but at least two martian datums have been used to locate places there. Datums are used in geodesy , navigation , and surveying by cartographers and satellite navigation systems to translate positions indicated on maps paper or digital to their real position on Earth.

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