Until 1927, "Turkish time" (or alla turca time or ezânî time) referred to the system of setting the clocks to 12:00 midnight at sunset.[4] This necessitated adjusting the clocks daily, although tower clocks were only reset two or three times a week,[5] and the precise time varied from one location to another depending on latitude and longitude.[4] The day was divided into two 12-hour periods, with the second 12:00 occurring at a "theoretical sunrise."[4][5] In practice, the Turkish railroads used both Turkish time (for public schedules) and eastern European time (for actually scheduling the trains), and government telegraph lines used St. Sophia time (i.e., Paris time + 1:47:32) for international telegrams.[5]