![]() ![]() ![]() Īnother theory is that the Babylonians subdivided the circle using the angle of an equilateral triangle as the basic unit, and further subdivided the latter into 60 parts following their sexagesimal numeric system. The use of a calendar with 360 days may be related to the use of sexagesimal numbers. Some ancient calendars, such as the Persian calendar and the Babylonian calendar, used 360 days for a year. Ancient astronomers noticed that the sun, which follows through the ecliptic path over the course of the year, seems to advance in its path by approximately one degree each day. ![]() One theory states that it is related to the fact that 360 is approximately the number of days in a year. The original motivation for choosing the degree as a unit of rotations and angles is unknown. History A circle with an equilateral chord (red). Because a full rotation equals 2 π radians, one degree is equivalent to π / 180 radians. It is not an SI unit-the SI unit of angular measure is the radian-but it is mentioned in the SI brochure as an accepted unit. The lined area is a right angle.Ī degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a measurement of a plane angle in which one full rotation is 360 degrees. One degree (shown in red) and eighty nine degrees (shown in blue). ![]()
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