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I present an exact and explicit solution to the scalar (Stokes fluxintensity) radio interferometer imaging equation on a spherical surface whichis valid also for non-coplanar interferometer configurations. This imagingequation is comparable to $w$-term imaging algorithms, but by using a sphericalrather than a Cartesian formulation this term has no special significance. Thesolution presented also allows direct identification of the scalar (spin 0weighted) spherical harmonics on the sky. The method should be of interest forfuture multi-spacecraft interferometers, wide-field imaging with non-coplanararrays, and CMB spherical harmonic measurements using interferometers.

Imaging on a Sphere with Interferometers: the Spherical Wave Harmonic Transform