September 21, 1666: Day of the Week
September 21, 1666 was the 264th day of the year 1666 in the Gregorian calendar. There were 101 days remaining until the end of the year. The day of the week was Tuesday.
The day of the week for September 21, 1666 under the old Julian calendar was Friday. Did you notice the difference with the Gregorian calendar?
If you are trying to learn Japanese then this day of the week in Japanese is Kayōbi.
A person born on this day will be 356 years old today. If that same person saved a Nickel every day starting at age 7, then by now that person has accumulated $6,383.05 today.
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Here’s the September 1666 Gregorian calendar. You can also browse the full year monthly 1666 calendar.
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Zodiac & Birthstone
Virgo is the zodiac sign of a person born on this day. Sapphire is the modern birthstone for this month. Agate 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 (September 21, 1666). 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.