Golf Shoulder Hip Separation

Calculate the smallest shoulder-to-hip rotational separation angle in a golf swing.

Description

Shoulder–hip rotational separation uses the smallest circular angle difference.

Shoulder–hip rotational separation uses the smallest circular angle difference. Full rotations are reduced modulo 360 degrees.^[1]

Calculate the smallest shoulder-to-hip rotational separation angle in a golf swing.

When to use Golf Shoulder Hip Separation

Use this tool to calculate the smallest shoulder-to-hip rotational separation angle in a golf swing.

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.

How to use Golf Shoulder Hip Separation and understand its results

Prepare the measured movement, timing, load or preassigned score requested. Keep protocols, units, paired measurements and caller-selected thresholds consistent.
Enter shoulderRotationDegrees, hipRotationDegrees using the field table and calculation rules, then run the tool.
Read separationDegrees. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
shoulderRotationDegrees	Shoulder rotation degrees	number	Required
hipRotationDegrees	Hip rotation degrees	number	Required

Enter finite signed angles. Return a separation from zero to 180 degrees.

raw=|shoulder−hip| mod360; separation=min(raw,360−raw)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
separationDegrees	Separation degrees	number

json

{
  "input": {
    "shoulderRotationDegrees": 60,
    "hipRotationDegrees": 30
  },
  "output": {
    "separationDegrees": 30
  }
}

Limitations and assumptions

No movement phase, coordinate tracking or swing-performance interpretation is supplied.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Hip Turn-to-Slide Ratio: Calculate hip turn-to-slide ratio from the supplied measurements. For a complementary task, use Swing Plane Angle Difference: Calculate swing plane angle difference from the supplied measurements.

References

Golf Shoulder Hip Separation — tool.io

Similar or alternative tools

Hip Turn-to-Slide Ratio
Calculate hip turn-to-slide ratio from the supplied measurements.
Swing Plane Angle Difference
Calculate swing plane angle difference from the supplied measurements.