time service

noun

: the determination and announcement of the precise time usually conducted as a part of the work of an astronomical observatory, usually based on transit observations of stars, and announced mainly by telegraphic and radio signals compare time signal

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“Time service.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/time%20service. Accessed 8 Dec. 2023.

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