October 31, 1517: Day of the Week
October 31, 1517 was the 304th day of the year 1517 in the Gregorian calendar. There were 61 days remaining until the end of the year. The day of the week was Wednesday.
The day of the week for October 31, 1517 under the old Julian calendar was Saturday. 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 Suiyōbi.
A person born on this day will be 500 years old today. If that same person saved a Quarter every day starting at age 6, then by now that person has accumulated $45,196.75 today.
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Here’s the October 1517 Gregorian calendar. You can also browse the full year monthly 1517 calendar.
Zodiac & Birthstone
Scorpio is the zodiac sign of a person born on this day. Opal is the modern birthstone for this month. Jasper is the mystical birthstone from Tibetan origin that dates back over a thousand years.
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October 31, 1517 Historical Event(s)
- 1517Protestant Reformation: Martin Luther posts his 95 theses on the door of the Castle Church in Wittenberg.
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 (October 31, 1517). 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.