| The clock system is easily converted into a 360 degree system for more precise denotation | |
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| The angular distance between adjacent clock numbers is 30 degrees, a round unit that simplifies mathematical juggling | The stars moved in visible circles at a fixed rate, which could be measured by the constant escape of water from a water clock |
The standard double hour beru , of equinoctial length, representing two modern hours, of which there were 12 in the standard day umu , was not conceived as being one of day and one of night, but as being just two consecutive equal-length hours.
6| There is no need to half the angle | There the sun is seen mid-way between sunrise and sunset |
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| For holes that are on a slope, the hole is imagined to be the center of a clock face with 12:00 at the high point and 6:00 at the low point | The modern system retains much of the sexagesimalism of the Sumerians, but typically not with the same detail |
30 standard days were a standard month, and 12 of those a standard year of 360 days.
20| - latin post meridiem, meaning after midday | journal of the Economic and Social History of the Orient |
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| However, in , a clock position refers to a horizontal direction | From golf [ ] Golf players use the clock system to study the course of the ball in situations |
Dohrn-van Rossum, Gerhard; Dohrn, Gerhard 1996.