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Universal Time Day Timescale
The Univeral Time Day (UTD) timescale covers just one day of 24 hours.
The UTD timescale is used in the layout of sundial faces where the noon hour point is to be adjusted to account for the difference between local mean solar time and timezone mean solar time.
UTD times may be calculated using the sdUTDx function.
00:00:00 UT = 0 UTD
and so on, and
23:59:59:99999 UT = .999999999988425926 UTD
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