A brief history of time measurement age 7 to 18 it was quickly noticed that the length of the day varies at different times of the year the reasons for this difference were not discovered until after astronomers accepted the fact that the earth travels round the sun in an elliptic orbit and that the earths axis is tilted at about 26 . A unit of time or time unit is any particular time interval used as a standard way of measuring or expressing duration the base unit of time in the international system of units si and by extension most of the western world is the second defined as about 9 billion oscillations of the caesium atom. Units of measurement the second is the base unit of time and other units like minutes hours etc are derived from it the measurement of time requires the specification of units but there are many different units of time some of which may be more appropriate in certain circumstances than others. History of measuring time when you finish this page try the history of measuring time quiz prehistoric man by simple observation of the stars changes in the seasons day and night began to come up with very primitive methods of measuring time
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