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Astronomical Time and Atomic Time

Skip to main content Print Version Back Content Start Social Network End Social Network ICMS better copy from here Astronomical Time and Atomic Time Written by: LAU Dick-shum       September 2013 Basically there are two types of time standards.  One is based on astronomy and is called "Astronomical Time".  The other is based on the frequency of atomic oscillations and is called "Atomic Time". Astronomical Time is based on the repetition of astronomical events for setting frequency standards.  For example, the occurrence of day and night is caused by the rotation of the Earth, and seasons by the Earth revolving around the Sun.  In the past, people used sundial to indicate the time derived from the sun's apparent position, and was referred to as "Apparent Solar Time".  However...

Linked on 2017-04-03 20:56:00 | Similar Links