Obsolete Russian units of measurement Peter the Great replace it with the Hindu-Arabic numeral system. The basic unit is the Russian cubit, called the "arshin", which has been in use since the 16th century. It was standardized by Peter the Great in the 18th century to measure exactly twenty-eight English inches (). Thus, 80 vershoks = 20 piads = 5 arshins = 140 English inches (). A "piad" (, “palm”, “five”) or "chetvert" (, “quarter”) is a hand span, the distance between ends of the spread thumb and index finger. Alternative units: As in many ancient systems of measurement the Russian distinguishes between dry and
Ancient Roman units of measurement mean solar day. Although the division of hours into minutes and seconds did not occur until the middle ages, ancient astrologers had a "minuta" equal to of a day (24 modern minutes), a "secunda" equal to of a day (24 modern seconds), and a "tertia" equal to of a day (0.4 modern seconds). Ancient Roman units of measurement were added to the Unicode Standard in April 2008 with the release of version 5.1. The Unicode block for ancient Roman units of measurement, called Ancient Symbols, is U+10190–U+101CF, i.e. in the upper plane: Ancient Roman units of measurement The ancient Roman