epact

The astronomer calculates the epact for the upcoming calendar year.

Definition

1. Noun:
   • Astronomical term: "epact" refers to the number of days by which the solar year exceeds the lunar year of 12 lunar months, used in calculating the date of Easter and other movable feasts in the ecclesiastical calendar.

Usage Examples

• (The difference in days between the two calendar systems.)
• (The epact helps set the date for Easter.)

Advanced Usage

• "epact of the year": the specific epact value assigned to a given year in the Gregorian or Julian calendar.

  • The epact of the year 2024 is 23, indicating a significant gap between lunar and solar cycles. (The numerical value for that year's epact.)

• "epact table": a table listing epact values for a sequence of years, used in liturgical computations.

  • The church consulted the epact table to schedule the movable feasts. (A reference chart for epact numbers.)

Variants and Related Words

• Epactal (adj): relating to or involving an epact.

  • The epactal adjustments are necessary to keep the lunar calendar aligned with the solar year. (Pertaining to the epact.)

• Proemptosis (n): the addition of a day to the epact to correct for calendar drift (a related technical term).

  • The proemptosis was applied to the epact to account for the accumulated error. (A correction to the epact.)

Synonyms

• Lunar-solar difference: the discrepancy between the lunar and solar year lengths.
• Calendar gap: the number of days separating the lunar and solar calendars.

Phrasal Verbs

• None: "epact" is not used in phrasal verbs due to its technical nature.

Related Idioms

• None: "epact" is a specialized term and does not appear in common idioms.