The pace is an uncommon US customary unit of length denoting a brisk step and equal to 2½ feet or 30 inches (75.2 cm). The term "pace" is also used to translate similar formal units in other systems of measurement. Pacing is also used as an informal measure in surveying, with the "pace" equal to two of the surveyor's steps reckoned through comparison with a standard rod or chain.
The Roman pace (Latin: passus) was a Roman unit of length. It was notionally the distance of a full stride from the position of the heel where it raised off of the ground to where it set down at the end of the step—i.e., two steps, one by each foot. Under Agrippa, it was standardized as the distance of two steps (gradūs) or five Roman feet (pedes), about 1.48 meters or 4 feet 10 inches. There were 1000 paces in the Roman mile, which was named after that distance as the mille passus or passuum.
The Byzantine pace (Greek: βήμα, bḗma) was an adaption of the Roman step, a distance of 2½ Greek feet. The double pace (βῆμα διπλοῦν, bḗma diploûn), meanwhile, was similar to the Roman unit, comprising 5 Greek feet.
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