For questions about different systems of measuring time.

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53
votes
10answers
11k views

Why does the United States keep using “old” date representations and imperial system, while being in the minority?

Other than the US (and a few other countries), the vast majority of countries use International System of Units (SI). Celsius temperature scale. DMY or YMD date format¹. 24-hour clock when written². ...
16
votes
5answers
235 views

What was the Julian Calendar aligned to?

I understand that the Julian Calendar was introduced to align the length of the calendar to the tropical year, i.e. make the average year 365.25 days long. However, what I'm still trying to figure out ...
14
votes
1answer
287 views

What was the motivation for the Gregorian Calendar?

The Gregorian Calendar eventually replaced the Roman calendar at some point, I know this was something to do with the days not being quite accurate so specific days (I think equinox and solstice) were ...
14
votes
1answer
285 views

in what form did William the Conqueror write the date of his own coronation?

This is a question about the English legal calendar as viewed by people living at the time, not as historians recorded it later. New year shifts to 1-January To the best of my understanding, the ...
13
votes
2answers
223 views

What is the earliest reliably dated event exact to the year?

How far does reliable counting of the years reach into the past: with the help of dating methods? using only primary sources?
13
votes
2answers
141 views

In the French Republican calendar: were Quintidis holidays?

I did some research on the French Republican calendar and found some contradictory information on weekly (or decadian?) holidays. Wikipedia (and most other articles I found) mention: The ...
9
votes
1answer
123 views

Why did the start of the Roman consular year move?

Thus quoth wikipedia: The first day of the consular term changed several times during Roman history. It became 1 January in 153 BC. Question is: why? (And what is the source, since wiki is ...
8
votes
6answers
1k views

Is every major culture in the same year?

In the Western world the current year is 2014, which is the number of years since the birth of the Christian messiah. Given that Christianity is not the dominant religion in every part of the world, I ...
8
votes
1answer
296 views

Who uses a pre-“Gregorian” calendar and why?

Here's a "day job" question that apparently has its roots in history. A person with one of our (overseas) suppliers declined to work this week, because it's his Christmas holiday. He's Orthodox, and ...
7
votes
2answers
182 views

Which days in the Mayan calendar were most auspicious for performing sacrifices?

In Classic Mayan civilization, human sacrifices were performed. I've read that there were days that were more and less auspicious for sacrifices, but I haven't been able to find out which days those ...
7
votes
1answer
189 views

How did the French take the Republican Calendar?

I've been wondering what the reactions were in France to the new Republican Calendar. When I learned about it in school, it seemed ridiculously overzealous to me, and this notion hasn't left me since. ...
5
votes
2answers
211 views

Historically, how come we have 7 days in a week? [closed]

I know jewish culture tend to like number 7. What about other cultures? Do we have 7 days in a week from bible? Why do we derive 7 days a week from jews? Why not from more prominent culture, like ...
5
votes
1answer
98 views

Who is responsible for the oldest known calendar?

What is the oldest known calendar? Where exactly was it developed? Who was responsible for its creation?
5
votes
0answers
48 views

Date of the death of Socrates

Question 1: The death of Socrates is usually said to have happened in 399 BC, but I've sometimes seen a question mark after the date. Is there actually a possible uncertainty about the exact year? ...
4
votes
2answers
93 views

What holidays would be on a European-centric calendar from the 11th - 13th Centuries?

I've often come across readings that mentioned there were numerous holidays in calendars in use within the Christian Churches or Church controlled lands, with work stopping on worship days, feast days ...
3
votes
1answer
112 views

How is the year “753 BC” given in ancient legends about the founding of Rome?

According to tradition, the founding of Rome by the legendary figures Romulus and Remus occurred in the year "753 BC". Of course, ancient Roman scholars would not have referenced that date using the ...
3
votes
1answer
48 views

Mayan calendar coinciding with winter solstice

It appears that all anyone has been talking about is the end of the world, misinterpretations aside (at least I hope so) my understanding that this is simply the end of an age of the Mayan calendar. ...
2
votes
1answer
117 views

How strong is the current theory of the beginnings of Chinese writing?

I've heard the claim that the current Chinese calendar was introduced some times around 2637 BCE by Emperor Huang Di. Apparently, written records date back to about 4,000 years ago and before that the ...
2
votes
0answers
42 views

Is this absolute timeline correct? [closed]

I always thought it put things into perspective if, instead of the Gregorian Calendar, we had a kind of "absolute" timeline, going all the way back to the big bang, as well as we can define it as of ...
0
votes
1answer
67 views

How were years numbered on the Republican Calendar? [closed]

The French Republican Calendar was created after the revolution to remove all religious references from the calendar, but how were years numbered on it? The Gregorian Calendar (which was used before ...