Friday December 18, 1271
A date scroll with Latin text from β€œThe Extremes of Good and Evil” by Cicero, written in 45 BC.

December 18, 1271: Day of the Week

December 18, 1271 was the 352nd day of the year 1271 in the Gregorian calendar. There were 13 days remaining until the end of the year. The day of the week was Friday.

The day of the week for December 18, 1271 under the old Julian calendar was Friday. Did you notice the similarity with the Gregorian calendar?

If you are trying to learn French then this day of the week in French is vendredi.

A person born on this day will be 753 years old today. If that same person saved a Dime every day starting at age 5, then by now that person has accumulated $27,323.70 today.

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Here’s the December 1271 Gregorian calendar. You can also browse the full year monthly 1271 calendar.

December 1271
SunMonTueWedThuFriSat
  12345
6789101112
13141516171819
20212223242526
2728293031  

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Zodiac & Birthstone

Sagittarius is the zodiac sign of a person born on this day. Turquoise is the modern birthstone for this month. Onyx is the mystical birthstone from Tibetan origin that dates back over a thousand years.

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December 18, 1271 by the Numbers

  • 275,064 days since December 18, 1271
  • 753 years, 1 month, and 5 days ago
  • 9,037 months since then
  • December 18 is in the 51st week of the year 1271 (ISO 8601)
  • 39,294 weeks ago
  • The year 1271 is not a leap year

December 18, 1271 Historical Event(s)

1271
Kublai Khan renames his empire “Yuan” (ࠠ3; yuán), officially marking the start of the Yuan Dynasty of Mongolia and China.

Gregorian versus the old Julian calendar

A note to students, teachers, scholars and anyone else passionate about this topic. As stated in the front page, this website is using the Gregorian calendar as the basis for all “day of the week” computation whether or not the Gregorian calendar is relevant for the date in question (December 18, 1271). Educators should point out the primary reason why Pope Gregory XIII introduced a new calendar system in October 1582. That is, to make the computation for the annual date of Easter more accurate since it is the foundation of the Christian faith.

Even with that purpose in mind, the Gregorian calendar too will become out of sync. It has a known approximation error of about one day for every 7,700 years assuming a constant time interval between vernal equinoxes (which is not true). This is better compared to the one day for every 128 years error of the Julian calendar.

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