seconds pendulum

noun

: a pendulum requiring exactly one second for each swing in either direction or two seconds for a complete vibration and having a length between centers of suspension and oscillation of 99.353 centimeters at sea level in latitude 45 degrees

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“Seconds pendulum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/seconds%20pendulum. Accessed 29 Mar. 2023.

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