Star transit Totally Explained

Everything about Star Transit totally explained

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 in Geodesy. 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 other elektro optical sensors: as above, time often better
semi automatic instruments: Photography or "impersonal micrometer", ca. 2 times better than No.1
by Scanning methods: Astrometry satellites like Hipparcos about 0,01".

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