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Questions tagged [time]

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4
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2answers
86 views

Why were extremely accurate sundials necessary in India?

I'm thinking specifically of the Jantar Mantar sundial in Jaipur, India, the Samrat Yantra. It is apparently accurate to within 2 seconds, and was built around 1740. What would such an accurate ...
0
votes
2answers
77 views

Were people in the ancient or medieval times aware of how exactly a solar year is equal to a lunar year?

Was it common knowledge around 600 AD or perhaps 30 BCE that 200 solar years for example were equal to 209 lunar years? In which period of history precisely can we say that such a thing was confirmed?
3
votes
2answers
140 views

Did English ever use a third (1/60 of a second) for measuring time?

An hour has been divided in sixty minutes since medieval times. During the 16th and 17th century, clocks measuring a second subdivision emerged. Today we still use the sexagesimal system for ...
1
vote
2answers
568 views

How did people count seconds before clocks were invented?

How did people count seconds? How did people count minutes? How come that every second of a clock takes exactly as much time as needed to be 86400 to fulfill 24 hours and 31536000 to fulfill a year? ...
3
votes
2answers
164 views

Was there ever a proposal for Metric time

The time keeping system I've been taught and use has the following (cumbersome) units: Months, Days of the month, hours of the day, minutes of the hour, and seconds of the minute... above and below ...
3
votes
4answers
712 views

Have there been accurate alternative clocks/ways to tell time?

As I understand it, pretty much everybody uses the "Babylonian/sexagesimal" time format: 12/24 hours in a day, 60 minutes in an hour and 60 seconds in a minute. Have there been alternative systems to ...
1
vote
3answers
522 views

Why does the start of the calendar year not correspond to a natural event?

Why is Jan. 1, the start of a new year, several days after the Winter Solstice, instead of coinciding with a solstice or equinox or other natural annual event? Note: The question does not ask why ...
1
vote
0answers
222 views

Did Einstein really say this quote about time? [closed]

This quote is commonly attributed to Albert Einstein, especially in: "The only reason for time is so that everything doesn't happen at once." However, there ...
5
votes
2answers
189 views

Why did Greek Olympic games take place every fourth year?

I was wondering why Greeks chose to have Olympic games every four years. Now, since we usually every fourth year is a leap one, it makes sense; but the reform of the calendar which stated this is due ...
9
votes
2answers
466 views

What is the historical basis for the length of a year?

It is currently accepted that a year is equal to the time it takes for the earth to revolve around the sun. However around Roman times, Ptolemy's geocentric model was the widely accepted view of ...
5
votes
2answers
328 views

When was the issue of time zones first described?

What are the earliest recorded acknowledgements of the concept that motivates time zones - that the sun and other celestial objects appear in different parts of the sky to people at different ...
5
votes
1answer
189 views

How did the notion of “time” come in the world of physics?

I was trying to figure out how people came to know about time then I realized that people started keeping track of time to know about sunset and sunrise. But I can't figure out how did time came into ...
16
votes
3answers
861 views

When and on what basis was it decided that an hour have 60 minutes and a minute have 60 seconds?

There were always some or he other means of measuring(estimating) the time. But I always wonder that when and how the present time system (1 Hr. = 60 Min., 1 Min. = 60 Sec.) evolved ?