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tropical year

(Encyclopedia)tropical year, time between successive vernal equinoxes; 365 days, 5 hr, 48 min, 46 sec of mean solar time (see solar time). The tropical year is the basis of the year used in the Gregorian calendar. ...

Rogation Days

(Encyclopedia)Rogation Days, in the calendar of the Western Church, four days traditionally set apart for solemn processions to invoke God's mercy. They are Apr. 25, the Major Rogation, coinciding with St. Mark's D...

synodic period

(Encyclopedia)synodic period sĭnŏdˈĭk [key], in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e., returns to the same elongation. Because ...

Gregory XIII

(Encyclopedia)Gregory XIII, 1502–85, pope (1572–85), an Italian named Ugo Buoncompagni, b. Bologna; successor of St. Pius V. He is best known for his work on the calendar, and the reformed calendar, the Gregori...

Easter

(Encyclopedia)Easter [A.S. Eastre, name of a spring goddess], chief Christian feast, commemorating the resurrection of Jesus after his crucifixion. In the West, Easter is celebrated on the Sunday following the full...

year

(Encyclopedia)year, time required for the earth to complete one orbit about the sun. The solar or tropical year is measured relative to the sun and is equal to 365 days, 5 hr, 48 min, 46 sec of mean solar time (see...

Whitby, Synod of

(Encyclopedia)Whitby, Synod of, called by King Oswy of Northumbria in 663 at Whitby, England. Its purpose was to choose between the usages of the Celtic and Roman churches, primarily in the matter of reckoning the ...

Valentine, Saint

(Encyclopedia)Valentine, Saint, d. c.270, Roman martyr priest. The customs connected with him in English-speaking countries are probably a survival from a period when a pagan festival associated with love occurred ...

Sin, in ancient Middle Eastern religions

(Encyclopedia)Sin sĭn [key], moon god of Semitic origin, worshiped in ancient Middle Eastern religions. One of the principal deities in the Babylonian and Assyrian pantheons, he was lord of the calendar and of wis...

Agatha, Saint

(Encyclopedia)Agatha, Saint ăgˈəthə [key], 3d cent., Sicilian virgin, martyred under Roman Emperor Decius. She is mentioned in the Martyrology of Jerome and the Calendar of Carthage in the 6th cent. Agatha is i...