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This wobble in Earth’s rotation occurs because the axis around which our planet rotates doesn’t quite line up with its actual geometric axis of symmetry, causing the rotational axis to keep trying to adjust.

Where a changes the width of the curve, b shifts the axis of symmetry to the left or right, and c slides the curve up or down.

The midpoint, or average, of r and s is the axis of symmetry of the parabola.

The two solutions to the quadratic equation will be the axis of symmetry plus or minus an unknown amount, which we’ll call u.

For a binary pair to produce that shape, the nebula’s long axis of symmetry should point in the same direction as the axis around which the stars orbit.