Degrees of time on a standard clock are measured in hours, minutes, and seconds of arc of a plane angle. 360 degrees of arc equal 1 hour, 60 minutes, or 3600 seconds.

From any position on the surface of the Earth, the Sun appears in the sky from east to west at the rate of 15 degrees in 1 hour, 1 degree in 4 minutes.

An orbital space telescope is capable of locating an angle of direction to within a precision of 12 one-thousandth degree of a second of arc, and can maintain its stability to within 7 one-thousandth degree of a second of arc.

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