Geodetic astronomy

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Geodetic astronomy or astro-geodesy is the application of astronomical methods into networks and technical projects of geodesy.

The most important topics are:

Important measuring techniques are:

The accuracy of these methods depends on the instrument and its spectral wavelength, the measuring or scanning method, the time amount (versus economy), the atmospheric situation, the stability of the surface resp. the satellite, on mechanical and temperature effects to the instrument, on the experience and skill of the observer, and on the accuracy of the physical-mathematical models.

Therefore the accuracy reaches from 60" (navigation, ~1 mile) to 0,001" and better (a few cm; satellites, VLBI), e.g.:

See also