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Questions tagged [time-keeping]

Time-keeping is for all methods to measure time. For example, questions about the hourglass, the sundial, and atomic clocks all fit into "Time-keeping"

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30
votes
12answers
9k views

Why of all units is Time standard?

I'm an American science student, and as such have to constantly fight with the metric and English unit systems. One thing that a couple other students and I were wondering is why, of all the different ...
16
votes
6answers
1k views

How did people wake up on time before alarm clocks?

How did people wake up on time before alarm clocks? I was thinking about this as I lay me down to sleep last night, and came up with a null hypothesis: They didn't. Keeping precise time wasn't ...
4
votes
1answer
317 views

sense of time in people with no means for time measurement

How did early, e.g. ancient to early medieval times, people have a sense of time, i.e. an hour, with no clocks around? I am aware that mechanisms for time measurement existed, sundials, water clocks, ...
17
votes
5answers
12k views

What is the origin of Indian weekday names?

The days of the week in several Indian languages are named after the same planets/gods as the Graeco-Roman days of the week. Did these arise from some common source predating both (PIE?), or was the ...
16
votes
2answers
3k views

Why did the clocks go back in Shanghai on December 31, 1927?

If you are a Stack Overflow user you may already have read Jon Skeet's excellent answer that discusses a time zone change at the end of 1927 in Shangai, when the clocks went back for 5 minutes and 52 ...
23
votes
10answers
1k 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 ...
-2
votes
1answer
301 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 ...