December 21, 1221: Day of the Week
December 21, 1221 was the 355th day of the year 1221 in the Gregorian calendar. There were 10 days remaining until the end of the year. The day of the week was Tuesday.
The day of the week for December 21, 1221 under the old Julian calendar was Tuesday. 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 mardi.
A person born on this day will be 800 years old today. If that same person saved a Cent every day starting at age 5, then by now that person has accumulated $2,903.47 today.
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Here’s the December 1221 Gregorian calendar. You can also browse the full year monthly 1221 calendar.
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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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 21, 1221). 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.
Now try another date like anniversaries, birthdays of someone you know or any other date that is special to you. Don’t forget to share the info to your friends, loved ones or social media followers. Who knows, they might appreciate and thank you for it.