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A day's journey in pre-modern literature, including the Bible [1] [2] and ancient geographers and ethnographers such as Herodotus, is a measurement of distance.
In the Bible, it is not as precisely defined as other Biblical measurements of distance; the distance has been estimated from 32 to 40 kilometers (20 to 25 miles). Judges 19 records a party of three people and two mules who traveled from Bethlehem to Gibeah, a distance of about 10 miles, in an afternoon. Porter [3] notes that a mule can travel about 3 miles per hour, covering 24 miles in an eight-hour day.
Another citation comes from Priscus (fr. 8 in Müller's Fragmenta Historicorum Graecorum ) and is translated thus by J. B. Bury: We set out with the barbarians, and arrived at Sardica, which is thirteen days for a fast traveller from Constantinople. From Constantinople (Istanbul) to Sofia is 550–720 km (311–447 mi.) distance; the passage, then, implies a pace between 42 and 55 km /day (26–34 mi./day).
Based on a comprehensive review of references in Herodotus, Geus [4] concludes that "Herodotus has a very well-defined notion of what distance a traveller can cover under normal circumstances in a day (between 150 and 200 stades or roughly, between 27 and 40 kilometres [17 and 26 mi.])," though he cites some exceptional examples of over 100 km (62 mi.) per day.
