SHTOOLS --- Tools for working with spherical harmonics

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Spherical Harmonic Rotations

djpi2 Compute the rotation matrix d(π/2) used in rotating data expressed in spherical harmonics.
SHRotateCoef Determine the spherical harmonic coefficients of a complex function rotated by three Euler angles.
SHRotateRealCoef Determine the spherical harmonic coefficients of a real function rotated by three Euler angles.

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