Babylonian time system

The Babylonian time system called Horae ab Ortu in some sundials divides the day into 24 equal parts, like the Italic hour system. It is characterized by Start your measurement taking the phenomenon of solar sunrise as a reference, starting to count from hour 24h (or 0h) until sunrise the next day. Babylonian astronomers measured time at night using systems of equal hours that they regulated by time clocks. For them, the heliacal rise was a natural reference position in measuring astronomical events. This form of measurement passed to the ancient Egyptians and the name Babylonian remained for the way of measuring time with reference to the heliacal orthos.

Features

The Babylonian time system is similar to the Italic, it divides the day into 24 equal hours, but unlike the Italic, the Babylonian begins counting the hours at dawn. The Babylonian system has as its origin the time system, on any day of the year, the period called ortho. In the case of the sun, atmospheric refraction and its intense brightness make it difficult to determine ortho. In many of the initial calculations, the half hour that a twilight can last was not taken into account.

The Italic and Babylonian time systems were prior to the civil hour system, as can be seen in various gnomonic treatises of the time. The civil hour system was established in the late period in which mechanical watches began to be used, in this way they can be found on the dials of some mechanical watches "ad modum bell& #3. 4; or "concordat cum rotali", is the time when the solar meridians served as adjustments for the new devices that were precursors of the pocket watch.