Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ivsg.conf...69c&link_type=abstract
International VLBI Service for Geodesy and Astrometry 2000 General Meeting Proceedings, edited by Nancy R. Vandenberg and Karen
Astronomy and Astrophysics
Astronomy
Scientific paper
Everything we do in VLBI is connected to time. In this contribution, we review 28 orders of magnitude of the spectrum of time ranging from a few hundred femtoseconds (i.e. one degree of phase at Xband ic 10_13 seconds) upwards to tens of millions of years (i.e. ten million years iT 1014 seconds). In this discussion, we will pay special attention to the relation between the underlying oscillator (the frequency standard that defines a clock’s rate) and the time kept by the clock (which counts the oscillations of the frequency standard). We will consider two different types of time time kept by counting an atomic frequency standard (Hydrogen Maser or Cesium), and time reckoned by the rotation of the Earth underneath the stars and sun.
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