astronomical time clock

[11.5.9.2]

NOTE: This term and its definition were changed in RP-16-17 Addendum 2 and Addendum 4. Deletions have a strike-through. New text is bold.

Previous name: astronomical time clock.

A time clock with automatic compensation for the annual change in length of day such that the switching operation is coordinated with daylight conditions.

A time switch control that automatically compensates for local sunrise and sunset times across the year.

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