Category
page 1Gregorian calendar
Gregorian calendar
internationally accepted civil calendar
Common Era
modern calendar era
Ole Rømer
Danish astronomer (*1644 – †1710)
Christopher Clavius
German astronomer and mathematician (1538–1612)
Aloysius Lilius
Italian astronomer
common year starting and ending on Sunday
type of year A on a solar calendar according to its starting and ending days in the week
common year starting and ending on Saturday
type of year B on a solar calendar according to its starting and ending days in the week
common year starting and ending on Monday
type of year G on a solar calendar according to its starting and ending days in the week
common year starting and ending on Thursday
type of year D on a solar calendar according to its starting and ending days in the week
common year starting and ending on Tuesday
type of year F on a solar calendar according to its starting and ending days in the week
common year starting and ending on Wednesday
type of year E on a solar calendar according to its starting and ending days in the week
common year starting and ending on Friday
type of year C on a solar calendar according to its starting and ending days in the week
leap year starting on Tuesday and ending on Wednesday
type of year FE on a solar calendar according to its starting and ending days in the week
leap year starting on Wednesday and ending on Thursday
type of year ED on a solar calendar according to its starting and ending days in the week
leap year starting on Monday and ending on Tuesday
type of year GF on a solar calendar according to its starting and ending days in the week
leap year starting on Friday and ending on Saturday
type of year CB on a solar calendar according to its starting and ending days in the week
leap year starting on Thursday and ending on Friday
type of year DC on a solar calendar according to its starting and ending days in the week
leap year starting on Saturday and ending on Sunday
type of year BA on a solar calendar according to its starting and ending days in the week
leap year starting on Sunday and ending on Monday
type of year AG on a solar calendar according to its starting and ending days in the week
dominical letter
method used to determine the day of the week for particular dates
Old Style and New Style dates
changes in calendar conventions from Julian to Gregorian dates
Inter gravissimas
papal bull
proleptic Gregorian calendar
extension of the Gregorian calendar before its introduction
Doomsday rule
way of calculating the day of the week of a given date
Sabbath in Christianity
inclusion or adoption in Christianity of a Sabbath day
determination of the day of the week
methods to calculate the day of the week
adoption of the Gregorian calendar
gradual global transition from traditional dating systems to the modern standard
solar cycle
28-year cycle of the Julian calendar
Zeller's congruence
algorithm to calculate the day of the week in the Gregorian and Julian calendars
Fasli Calendar
harvest-based calendar system
Giuseppe Moletti
Italian mathematician
Arabic names of calendar months
Arabic names of calendar months
century leap year
Gregorian calendar year exactly divisible by 400