Foot (unit)

A foot was a unit of distance measurement commonly in use in the United Kingdom, particularly during the Third Doctor's exile on Earth. The Doctor's time sensor was calibrated to read in terms of Venusian feet and miles. Though he once reckoned that there were about .225 Venusian miles for every Earth mile, he didn't give an exact relationship between Venusian and Earth feet, nor between a foot and a mile. However, Jo Grant did note that Venusian feet much be much larger than Earth feet. The Doctor confirmed with a pun, noting that Venusians themselves had feet so big they were always tripping over them. This suggested that the size of the Venusian unit of measurement had an anatomical origin. (DW: The Time Monster)