Description
A perspective projection developed to encompass a hemisphere plus the twilight zone (astronomical twilight is 18° beyond the hemisphere).
Classifications
azimuthal
perspective
Graticule
Meridians: Central meridian is straight. Other meridians are complex curves in the oblique form in which it is usually used.
Parallels: Complex curves in the oblique form in which it is used.
Similar projections
This projection is a specialization of the far-side perspective.
Other far-side perspectives are AMS lunar, Fischer far-side perspective, James far-side perspective, Gretschel….
Origin
Developed by Alexander Ross Clarke in 1879.