In calculations involving the Jewish calendar, an informal name for the helek, a unit of time equal to exactly 10/3 seconds. There are 1080 parts in an hour
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}