Use this horology calculation to interpret a stated watch, clock, timing-machine, water-resistance, alarm, or historical respiratory-timing quantity under its defined convention.

Sweep Degrees (deg)

Required number input.

Return Seconds (s)

Required number input.

Average angular return speed in degrees per second from sweep angle and return duration. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Return Degrees Per Second (deg/s)

The resulting return degrees per second returned as a number.

• Mechanical-watch amplitude and beat measurements depend on lift angle, position, state of wind, movement condition, instrument setup, and elapsed sampling. ATM markings are test-pressure classifications rather than literal safe diving depths.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm movement specifications and measure in multiple positions and power states; follow the manufacturer's water-resistance guidance and obtain pressure testing after case service.

• Retrograde Span Degrees

  Positive angular sweep of a retrograde indicator from start angle to end angle.

• Day Disc Advance Rate

  Day-disc angular advance in degrees per daily step for a specified number of disc positions.

• Sweep Steps Per Second

  Watch seconds-hand movement steps per second when each balance beat advances the hand once.