Navigation Sideral time

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From: "Craig"
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Subject: Navigation Sideral time
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Date: Wed, 5 Nov 2003 23:04:42 +0800
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C In celestrial navigation do they use sideral time clocks or standered time
C clocks?
C When navigating using longituded, greenwich time was or still is standard
C time or solar time?

Navigators use 'sidereal hour angle', SHA, which is the reverse
scale of right ascension and dimensioned in degrees. A star with RA of
18h00m has SHA of 90d.
For timekeeping, UTC is used exclusively, altho for onboard local
use, the timezone offset is included.

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