A spherical to ellipsoidal central body is bounded by radial structures. Cysts are small, with a spherical to ellipsoidal shape. Note that the equations are exact both for spherical and ellipsoidal Earth model. Note that the equation is exact both for spherical and ellipsoidal Earth model. EPSG's definition says the projection "uses spherical development of ellipsoidal coordinates". These whistles have mouthpieces in quadrangular, rectangular, ellipsoidal and conical shapes. Whether spherical or ellipsoidal, the principles discussed hold without loss of generality. Spores of the genus are thin-walled, inamyloid, hyaline, and have a cylindrical to ellipsoidal shape. The purplish-black fruit is an ovate, ellipsoidal or subglobose drupe. The ellipsoidal form of the polar ellipsoidal projection uses conformal latitude. Amalthea is irregularly shaped, with the best ellipsoidal approximation being . The orthogonal system of quadrics used for the ellipsoidal coordinates are confocal quadrics. Explicit expressions for formula 1 have been given for homogeneous anisotropic ellipsoidal bodies. The relation of Cartesian and ellipsoidal coordinates is discussed in Torge. Formulae for ellipsoidal datums are more involved.