Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [calendar]

For questions about different systems of measuring time.

0
votes
0answers
130 views

Why was the calendar chosen to have 7 long months and 5 short instead of a simpler opposite scheme? [on hold]

Having 7 long months and 5 short months lead to the odds of February sticking out with 28 days, or 29 in leap years. Having the opposite length of the months, 7 short and 5 long, would cive exactly ...
5
votes
2answers
271 views

When did humans start numbering years?

When did humans start to keep track of years with unique identifiers for each year? I assume that the realization that seasons were cyclic came first, and that at some point we decided to call each ...
0
votes
1answer
120 views

Which year was the first leap year?

From the Wikipedia article on leap years, it appears that calendar systems that predated the Romans accounted for leap days, but do we know which calendar was the first to introduce a leap day, and if ...
0
votes
1answer
208 views

Has anyone created a binary calendar?

Wondering if anyone has ever tried to make a calendar where everything is a power of 2, so maybe the day is divided into 16 and the hour is divided into 64, etc.
5
votes
1answer
136 views

How would ancient Sumerian astronomers predict length of the next lunar month?

I know we can do these predictions with extreme degree of precision now, using our extensive knowledge of celestial orbiting patterns and principles. With Sumerian civilization being one of the ...
3
votes
1answer
245 views

How old was the Egyptian calendar system?

I know that the Egyptians had a solar calendar, based on a certain effect of the sun over the Nile. I also know that it held 365 days without any fix to the quarter a day a year (like Feb 29th every ...
8
votes
2answers
351 views

Why did the Romans only name some months and number others?

There's a lot of sources on the internet which are happy to tell you that the Roman year originally had 10 months (Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September, October, November, ...
4
votes
1answer
567 views

How is the accuracy of the Maya Calendar measured?

It is taken as a fact in many books and specialized publications that the Maya calendrical system - the Haab' and the Tzolk'in - was more accurate and closer to the real solar year than the Gregorian ...
8
votes
2answers
333 views

Why was the date moved by 10 days instead of 9 during Gregorian calendar reform?

From Wikipedia: ... the Council of Trent authorized Pope Paul III to reform the calendar, requiring that the date of the vernal equinox be restored to that which it held at the time of the First ...
9
votes
6answers
8k views

Has there ever been a month with 32 days?

As the title says. I believe (and correct me if I'm wrong) that with our modern Gregorian calendar, no month will ever be longer than 31 days. But have there been any times in the (perhaps recent) ...
-3
votes
1answer
185 views

Why are doomsday predictions for 2012 seen as incompatible with historical Maya mythology/religion?

Interpretations of the Maya calendar that the world might end on date 13.0.0.0.0, Dec 21 2012, were often roundly dismissed as having no historical basis and being inconsistent with Maya beliefs. See ...
-1
votes
1answer
96 views

Was the date skip of the Gregorian calender reform understood to skip weekdays accordingly?

The date was adjusted, but did the general population, that was more concerned with the weekly rhythm, also adjust their weekday?
-2
votes
1answer
284 views

When did the current 24-hour day cycle begin? [closed]

Right now the clock just struck 1PM in England. If I went exactly 1000 hours back in time, I don't know exactly what time it would be in England, but it would be the top of the hour regardless. But ...
9
votes
2answers
2k views

When did the current 7-day week cycle begin?

Today it's Sunday. 7 days ago it was Sunday. 7000 days ago it was Sunday. But what about 70,000 days ago, 700,000 days ago, and 7 million days ago? Our current 7-day week cycle has not continued ...
2
votes
1answer
121 views

Why are some New Kingdom dates quotes in pairs two years apart?

I am reading about New Kingdom Egypt. Many events are doubly-dated. For example, Akhenaten's reign is given as 1353–1336 BCE or 1351–1334 BCE. These dates always seem to be two years apart. I ...
4
votes
2answers
153 views

An online old style Julian calendar for England?

The calendar (new style) act 1750 adopted the Gregorian calendar in England from 1752, and changed the start of the civil year from 25 March to 1 January. So, 1748-03-24 (old style) would have been ...
1
vote
1answer
79 views

History of calendar of different culture [closed]

Why in almost every calendar of different culture, a week consists of seven days? Are there any link between different calendars?
17
votes
2answers
530 views

Was Mid-Night always considered the transition point between two days in Gregorian/Julian Calendars?

Was the transition point between calendar days (in the gregorian\julian calendar), always been at midnight? If not, when did the midnight rule begin? And what was the determining time before that? ...
4
votes
2answers
435 views

What calendars were used in Eastern Rome?

I was hoping to shed some light on the calendars used in the Eastern Empire. Firstly, this question is related but without answer until now (and by me). It also doesn't encompass the later imperial ...
2
votes
1answer
386 views

In Ancient Cultures - How was a New Moon identified when it can never be seen?

In some ancient cultures, a Lunar Calendar was utilized and the "New Moon" is considered the "First of the Month". In ancient Semitic cultures, Assyria, Persia, Akkadia, Israel, etc - how was the "...
13
votes
2answers
1k views

When did Europeans make Sunday rather than Saturday the seventh day?

In the United States, calendars that list a week in one line are typically formatted like this: S M T W T F S Sunday is the first day of the week and Saturday is the seventh. That conforms to a ...
1
vote
1answer
169 views

How did they number the months when the year started on March 25th?

I've read that Great Britain and its colonies used March 25th as the beginning of the numbered year until 1752. I am wondering what this meant in terms of numbering the months (e.g. January is 1 and ...
3
votes
4answers
10k views

Which months were added during the Roman Empire?

I was recently reading a book when I came across a line Two months were added in our calendar today for the Roman empire. I did some research on Wikipedia and concluded three months were added ...
8
votes
1answer
587 views

When Julius Caesar reformed the calendar in 45 BC, why didn't he add any days to February?

In the creation of the Julian calendar, Julius increased the length of the months that weren't already 31 days long, except for February. Why?
13
votes
3answers
402 views

What, if any, celebrations or commemorations were done in 1000 AD?

By the 9th century, the Anno Domini system was the most widespread year numbering in medieval Europe. Humans like patterns. Surely people must have thought it significant when "999 AD" became "1000 ...
3
votes
1answer
126 views

How were/are days subdivided in non-Gregorian calendars?

In the Gregorian calendar, a day is subdivided into 24 hours, which each contain 60 minutes, which each contain 60 seconds. Internationally, a derived version of this calendar called UTC is used ...
5
votes
2answers
305 views

In Russia, are the anniversaries of the various events that occurred in 1917 and '18 observed according to the Old Style or the New Style calendar?

In Russia in 1917 and 1918, a number of important events, including the abdication and assassination of Czar Nicholas, and the Menshevik and Bolshevik revolutions occurred while the Old Style (Julian) ...
1
vote
1answer
159 views

Until what time was the Ancient Roman calendar era used?

Until what time was the Ancient Roman calendar era, based on the founding of Rome, used? Or what was the latest historical event that was mentioned in chronicles with an Ab Urbe Condita year?
2
votes
1answer
134 views

Correspondence between the modern and the antique calendar

How was the correspondence between Anno Domini and Anno Urbis Conditae eras made? How are modern historians proving that this correspondence is correct?
3
votes
1answer
14k views

Why have both July and August 31 days?

Is there a reason why months alternate between 30 and 31 days? 365.24/12 = 30.23666; there are many ways to allocate the .2366 days among the months. Why was this chosen? Is there a reason why July ...
6
votes
2answers
316 views

How was debt handled in the change over from the Julian calendar to the Gregorian?

I was reading about New Style and Old Style dates, and I thought about the deletion of dates during the transition. From Wikipedia's article on the Gregorian calendar: When the new calendar was ...
5
votes
1answer
392 views

Why does the US use MM/DD/YY?

Alternatively: why and when did others switch away from MM/DD/YY, if they ever used it? I always write out the month name to avoid ambiguity. Update: Since it came up in the comments, I'm asking ...
5
votes
1answer
218 views

Who fixed new year's day as 25th March in 1155 CE

I have read that New year's day was fixed at Lady Day 25th March from 1155 until the reform in 1752, but I can't find out who fixed it and why, can anybody help? Responding to the comment by C.G. ...
17
votes
3answers
3k views

What is the reason that not all roman emperors named a month after them?

As far as I know, Julius Caesar and Augustus named the fifth and the sixth months, respectively, after themselves, but why didn't Tiberius, Caligula, Claudius, and Nero do the same while there were ...
0
votes
0answers
36 views

When did they start counting the days from 1 to 31 in Europe? [duplicate]

In history the Romans didn't count their days of a month not by adding each day extra. But instead of that they used three moments in a month, Kalendae, nonae and Idus. And from those days they ...
15
votes
2answers
401 views

When was the change from kalends, ides and nones to numbers

The Romans named the days of the month by counting down to kalends, ides and nones. We use numbers counting up from one for the first day of the month. When did this change take place? I assume that ...
8
votes
1answer
356 views

Which calendar to use in English for non-European countries?

When a modern historian is writing about European history in the English language, I know it is customary to use either the Julian or Gregorian calendar, whichever was in force in the time and place ...
0
votes
0answers
19 views

When was the change from kalends, ides and nones to numbers [duplicate]

The Romans named the days of the month by counting down to kalends, ides and nones. We use numbers counting up from one for the first day of the month. When did this change take place? I assume that ...
5
votes
0answers
148 views

Why was the seventh day of the week in Quichua named after the sun?

In Tawantinsuyu, Incan society had a seven day week. The days could be enumerated as following: Monday: AWAKI puncha Tuesday: AWKARIK puncha Wednesday: CHILLAY puncha Thursday: KULLKA puncha ...
4
votes
1answer
186 views

When did Frankfurt am Main adopt the Gregorian Calendar?

The Gregorian Calendar was adopted in Habsburg lands in 1583. As Frankfurt am Main was a Free City within the Holy Roman Empire, it fell under direct control of the [Habsburg] Emperor. However, if I ...
2
votes
1answer
292 views

What was considered an epoch by the Phoenicians?

The Phoenicians used a lunisolar calendar similar to the Hebrew calendar. Do we have any idea about what Phoenicians considered as an epoch for their calendar, or at least about the nature of the said ...
14
votes
2answers
1k views

Why is the leap day on February 29th?

Every four years, besides some certain years, we have a leap year, where a 29th day is added to February in the Gregorian calendar, making the year 366 days long, rather than 365. This is to make up ...
5
votes
1answer
172 views

Were the dates of saints days moved as part of the Gregorian calendar reforms?

I understand that if one were to go back in time and ask a participant at the battle of Agincourt what the date was, he would (if he knew) say that it was the 16th of October, he would also (more ...
-2
votes
1answer
243 views

Why is a month so different from a year or a day? [closed]

I dont know whether this is the correct place to ask this, but I don't know anywhere else. A minute is 60 seconds, an hour 60 minutes, and a day 24 hours always. Again, a week is 7 days always. And ...
2
votes
3answers
2k views

What is the earliest written date?

What is the earliest written date found? When I say "date" I primarily mean a date in the Gregorian calendar (perhaps the calendar-year is most interesting). It could also be interesting to know ...
8
votes
3answers
695 views

Why does the Gregorian calendar start where it does?

The way a calendar is organized is very dependent on celestial events. A month is about the length of time the moon revolves around the earth and a year is the time the earth revolves around the sun. ...
7
votes
5answers
367 views

Where and when was the shortest calendar day in history, due to DST and calendar changes, etc?

I'm not asking about the length of daylight for the winter solstice. I'm asking about whole days that are shorter than 24 hours. For example, anywhere that observes Daylight Saving Time has one day ...
6
votes
1answer
1k views

How did historians sync up historical dates of different cultures? [closed]

How do people know, say, that some specific event happened in China 1200 BC? Or the Mayans did something in AD 150? Back then, didn't they all use a different calendar system?
12
votes
6answers
3k views

How was the current month and day disseminated to the townspeople of Medieval Europe?

How was the current month and day disseminated to the townspeople of the Medieval Europe? I'm quite sure that personal calendars weren't a thing back then... but I could be wrong... If they had a ...
17
votes
4answers
26k views

Why does Japan celebrate the Gregorian New Year but China still celebrates Chinese New Year?

Before Meiji Restoration, Japan used Chinese calendar and celebrated Chinese New Year just as China did. Nowadays, both Japan and China have adopted Western calendar. However, Japan celebrates ...