# The calendar and pocket watches

Jan 11
09:09

2012

Meng Lee

When focusing on pocket watches and time measurements it is all about a science that deals with the measurement of time, both from the standpoint of mathematical astronomy, and the historical-technical.

Look for pocket watches history facts! The voice "calendar" comes from calends and according to experts, it is the combination of chronological and resulting distribution of time used in each country to regulate human activity, indicating the days and times at work and civil and religious holidays." Put more simply, are the rules that determine the most accurate timing possible. Over the life of humanity we find several calendars, Roman, medieval Christian, the church, the modern French Republican, Muslim, etc. It is worth analyzing watches invention.

Time is regulated mainly by three factors: the day, month and year to which is added, in some cultures a week. The same system applies to pocket watches.

The day is the essential unity and the natural division of time. We can distinguish three types:

-         The calendar day. Light is the period that begins with sunrise and ends with his demise, having a variable length -15 h. 6 'to 8 h. 54 ', being in the two equinoxes 12 h. 60'-with the seasons.

-         On astronomical. Is the time it used to rotate the earth on its axis, with a duration of 23 h. 56 '4''.

We found different ways to indicate:

-         The Roman system. The Romans divided the month into three unequal parts that were initiated by the three parties on the calendar: the calendar (it was the first of each month), the seventh day in the months of March, May, July and October, and the fifth others) and the Ides (the 15th is celebrated in March, May, July and October, and 13 in the other).

The rest of the days are counted in a retrograde manner, starting from the party account future. If you analyze pocket watches, you will notice similarities. This system is also called "days trodden" and "to go". These are considered in the months of 28, 29 or 30 to day 14. Consists of 12 lunar months, with a duration of 344 days, 8 hours, 48 'and 36''.

The side real year can be defined as the length of time that elapses "between two consecutive steps of the sun through the same point of the sky in relation to the stars, to follow an elliptical 360 °. It lasts 365 days, 6 hours, 9 'and 9.5''. The tropical year or solar is the time between two consecutive steps of the sun through the vernal point, following the path of the ecliptic. It gives an average change: 365 days, 5 hours, 48 'and 48''. The calendar year is quite impressive. All measurements consist of the same structure. Even pocket watches belong to this adaptation of the astronomical year by eliminating the part of a day.

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