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.« Back to Definitions Index