Sunday January 13, 1005
A date scroll with Latin text from β€œThe Extremes of Good and Evil” by Cicero, written in 45 BC.

January 13, 1005: Day of the Week

January 13, 1005 was the 13th day of the year 1005 in the Gregorian calendar. There were 352 days remaining until the end of the year. The day of the week was Sunday.

The day of the week for January 13, 1005 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 Nichiyōbi.

A person born on this day will be 1,020 years old today. If that same person saved a Half dollar every day starting at age 3, then by now that person has accumulated $185,738.50 today.

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Here’s the January 1005 Gregorian calendar. You can also browse the full year monthly 1005 calendar.

January 1005
SunMonTueWedThuFriSat
  12345
6789101112
13141516171819
20212223242526
2728293031  

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Zodiac & Birthstone

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

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January 13, 1005 by the Numbers

  • 372,572 days since January 13, 1005
  • 1,020 years, 0 month, and 24 days ago
  • 12,240 months since then
  • January 13 is in the 2nd week of the year 1005 (ISO 8601)
  • 53,224 weeks ago
  • The year 1005 is not a leap year

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 (January 13, 1005). 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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