equation of time

noun

The discrepancy between two kinds of solar time: the apparent solar time, which directly tracks the motion of the Sun, and mean solar time, which tracks a theoretical "mean" Sun with noons that are twenty-four hours apart.

Meanings

nounequation of time (plural equations of time)

plural equations of time

  1. The discrepancy between two kinds of solar time: the apparent solar time, which directly tracks the motion of the Sun, and mean solar time, which tracks a theoretical "mean" Sun with noons that are twenty-four hours apart.

    Crafted in 18-karat white gold, this Jules Audemars Equation of Time offers hours and minutes, as well as date, days, months, leap years and moonphases. The watch also offers sunrise and sunset times, and equation of time.

    2005, Caroline Childers, Grand Complications: High Quality Watchmaking, page 317

Translations

Finnish ajantasaus
  • ajantasausdiscrepancy between two kinds of solar time
French équation du temps
  • équation du tempsdiscrepancy between two kinds of solar time
German Zeitgleichung
  • Zeitgleichungdiscrepancy between two kinds of solar time
Hungarian időegyenlet
  • időegyenletdiscrepancy between two kinds of solar time
Romanian ecuația timpului
  • ecuația timpuluidiscrepancy between two kinds of solar time
Cite this entry
APA

equation of time. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/equation%20of%20time

MLA

“equation of time.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/equation%20of%20time. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “equation of time,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/equation%20of%20time.

Source: equation of time on Wiktionary, CC BY-SA 4.0.