- Star transit
A Star transit is the passage of a star through the eyepiece of an
telescope .The precise observation of star transits is the basis of many methods in
Astronomy and inGeodesy . The measurements can be done in different way:
#visually (mostly up to 1990): accuracy 0,1" to 2" (depending on the instrument);timing with digital clocks about 0,05-0,2 seconds
# by CCD- and otherelektro optical sensor s: as above, time often better
# semi automatic instruments:Photography or "impersonal micrometer ", ca. 2 times better than No.1
# by Scanning methods:Astrometry satellite s like Hipparcos about 0,01".See also
*
Meridian circle
*Passage instrument
*Theodolite
* angular measurement
*accuracy
*precision
*Instrument error s
*Arc second s
*angular mil Literature
*
Karl Ramsayer , 1969: "Geodätische Astronomie", Vol.2a of Handbuch der Vermessungskunde, 900 p., J.B.Metzler-Verlag Stuttgart.
*Ivan I. Mueller , 1969: Spherical andPractical Astronomy as applied to Geodesy, 610 p., Fred.Ungar publ., USA
* IAU Coll.48: "ModernAstrometry ", Egermann, University Vienna.
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