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The time cards stamped by time clocks can serve as a timesheet or provide the data to fill one. These, too, are now often digital. Timesheets came into use in the 19th century as time books. To record time in a more granular fashion, time-tracking software may be used.
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The clock face with its clock positions is a heritage of Roman civilization, as is suggested by the survival of Roman numerals on old clocks and their cultural predecessors, sundials. The mechanical clock supplanted the sundial as the major timekeeper, while the Hindu–Arabic numeral system replaced the Roman as the number system in Europe in ...
The English word clock first appeared in Middle English as clok, cloke, or clokke. The origin of the word is not known for certain; it may be a borrowing from French or Dutch, and can perhaps be traced to the post-classical Latin clocca ('bell'). 7th century Irish and 9th century Germanic sources recorded clock as meaning 'bell'. [74]
Longcase clocks (grandfather clocks) typically use Roman numerals for the hours. Clocks using only Arabic numerals first began to appear in the mid-18th century. [citation needed] The clock face is so familiar that the numbers are often omitted and replaced with unlabeled graduations (marks), particularly in the case of watches. Occasionally ...
Woodcut of medieval clockmaker, 1568 Lateral view of a Timothy Mason longcase clock movement with striking mechanism, c. 1730. A clockmaker is an artisan who makes and/or repairs clocks. Since almost all clocks are now factory-made, most modern clockmakers only repair clocks.
Animation showing equation of time and analemma path over one year.. The United States Naval Observatory states "the Equation of Time is the difference apparent solar time minus mean solar time", i.e. if the sun is ahead of the clock the sign is positive, and if the clock is ahead of the sun the sign is negative.
As seen from above the Earth's north pole, a star's local hour angle (LHA) for an observer near New York (red dot).Also depicted are the star's right ascension and Greenwich hour angle (GHA), the local mean sidereal time (LMST) and Greenwich mean sidereal time (GMST).
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