Gregorian calendar - Invention - Article Index

Encyclopedia - Gregorian Calendar: Encyclopedia - Gregorian Calendar
The Gregorian calendar is the calendar that is used nearly everywhere in the world. A modification of the Julian calendar, it was first p...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - History
Gregorian calendar - Invention. The motivation of the Catholic Church in adjusting the calendar was to have Easter celebrated at the ti...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Number Of Leap Years Starting On A Given Day Of The Week
Because there are 97 leap years in every 400 in the Gregorian Calendar, there should, in each "cycle", be either 13 or 14 leap years star...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Days Of The Week
January 1 of any year whose number is a multiple of 400 is a Saturday. From this you can work out the day of the week of any date. See al...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Numerical Facts
When leap years and common years are taken into account, there are a total of 14 possible Gregorian calendars. When different dates of Ea...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Accuracy
The Gregorian calendar improves the approximation made by the Julian calendar by skipping 3 Julian leap days in every 400 years, giving a...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Proleptic Gregorian Calendar
The Gregorian calendar can, for certain purposes, be extended backwards to dates preceding its official introduction, producing the prole...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Confusion With British Vs. American Usage
Dates of events in Britain prior to 1752 are usually now shown in their original Old Style form, whereas dates of events in (then British...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Months Of The Year
The Gregorian calendar's year is divided into 12 months: English speakers sometimes remember the number of days in each month by the use ...   » Read the article

Encyclopedia - Gregorian Calendar: Encyclopedia Ii - Gregorian Calendar - Calendar Seasonal Error
This image shows the difference between the Gregorian calendar and the seasons. The Y axis is "days error" and the X axis is Gregorian c...   » Read the article