Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975spam.rept...59h&link_type=abstract
In ESRO Space Astrometry p 59-64 (SEE N75-30957 21-89)
Astronomy and Astrophysics
Astronomy
1
Astrometry, Astronomical Observatories, Atmospheric Attenuation, Latitude, Longitude, Micrometers, Photoelectricity, Position (Location)
Scientific paper
The role of atmospheric inhomogeneities is discussed for ground-based astrometric observatories. Modern photoelectric meridian circles will soon be able to produce observations with a mean error of 0.15 arc sec at a rate of nearly 100 observations per observing hour. If, however, the development of ground-based meridian techniques were to be intensified and an astrometrically optimal site for the instrument selected, an improvement in weight by two orders of magnitude could be envisaged. In a few years time it should be possible with a single meridian circle to collect observations which in accuracy, completeness and number by far surpass the results of all previous meridian observations.
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