Saturday February 15, 1564
A date scroll with Latin text from “The Extremes of Good and Evil” by Cicero, written in 45 BC.

February 15, 1564: Day of the Week

February 15, 1564 was the 46th day of the year 1564 in the Gregorian calendar. There were 320 days remaining until the end of the year. The day of the week was Saturday.

The day of the week for February 15, 1564 under the old Julian calendar was Tuesday. 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 Doyōbi.

A person born on this day will be 461 years old today. If that same person saved a Dime every day starting at age 5, then by now that person has accumulated $16,668.80 today.

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Here’s the February 1564 Gregorian calendar. You can also browse the full year monthly 1564 calendar.

February 1564
SunMonTueWedThuFriSat
      1
2345678
9101112131415
16171819202122
23242526272829

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Zodiac & Birthstone

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

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February 15, 1564 by the Numbers

  • 168,515 days since February 15, 1564
  • 461 years, 4 months, and 17 days ago
  • 5,536 months since then
  • February 15 is in the 7th week of the year 1564 (ISO 8601)
  • 24,073 weeks ago
  • The year 1564 is a leap year

Who was born on February 15, 1564?

1564
Galileo Galilei, Italian astronomer and physicist (d. 1642)

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 (February 15, 1564). 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.

Share InfoNow 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.