sidereal time
noun
1
: time based on the sidereal day
2
: the hour angle of the vernal equinox at a place
Examples of sidereal time in a Sentence
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That extraordinary feature is paired with a sidereal time display, a perpetual calendar, moon phases, and the equation of time display, as well as a minute repeater, grande and petite sonnerie functions, a chronograph, and AP’s only tourbillon in a pocket watch from this era.
—
Nicole Hoey, Robb Report, 9 Dec. 2025
The sky chart is a disk that rotates at a speed of sidereal time (23 hours, 56 minutes and 4 seconds).
—Roberta Naas, Forbes, 7 Apr. 2021
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Nicole Hoey, Robb Report, 9 Dec. 2025
The sky chart is a disk that rotates at a speed of sidereal time (23 hours, 56 minutes and 4 seconds).
—Roberta Naas, Forbes, 7 Apr. 2021
Cite this Entry
“Sidereal time.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sidereal%20time. Accessed 17 Dec. 2025.
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