Julian day

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Julian day

noun Julian days

A date expressed as a real number of days counted with GMT noon on 1 January 4713 BCE in proleptic Julian calendar (November 24, 4714 BCE, in the proleptic Gregorian calendar) as zero; used primarily by astronomers and historians to compare events recorded in different cultures.
Similar: JD, Julian date

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MLA

"Julian day." Wiktionary, via Micwyn, micwyn.com/word/julian%20day. Accessed 6 Nov. 2026.

APA

Julian day. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/julian%20day

Chicago

"Julian day." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/julian%20day.

BibTeX

@misc{julian_day_2026,
  title = {Julian day},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/julian%20day},
  urldate = {2026-11-06}
}