A composite of two variants of the Strebe-Snyder Flat-Pole projection, with Bonne φ1 = 20°N for the northern and 20°S for the southern hemisphere.
Introduced in my blog.
Also see Strebe’s 1992 Equal-area Projections.
Jump to different depiction of this projection:
Specified in [square brackets]: Actual size of the projection
(minus the black or white background). When marked with [≈], sizes with and without
background are approx. the same.