How do you measure time?
The calculation of the passage of time is based on the rotation of the Earth on itself and around the sun The amount of time that our planet takes to perform a rotational movement is called day. This is divided into 24 equal periods called hours, which consist of 60 fractions, or minutes. But generally used fraction is the second; 60 of them equal one minute. On the other hand, the period of time the Earth takes to make its movement around the Sun is called the year. The year is divided into 12 periods, or months that have 30 or 31 days. In fact, the translation application 365 days, 6 hours, 9 minutes and 24 seconds. It is for them than every 48 months, the so-called leap years, add a day in February, which is achieved annual error of a little over 6 hours.
To measure time clocks are used. Throughout history various clocks were invented, such as solar, water clock, which used water-the sand, and Digital, among others.
Who invented the calendar?
The Egyptians divided the year into 365 days. The difference of 6 hours was corrected by order of Julius Caesar introduced the Julian calendar, which included a leap year every 36 months. This period was brought to 48 months by the Emperor Octavian. Pope Gregory XIII corrected the error accumulated up to the fourteenth century, with the Gregorian calendar which currently governs.
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