Gnomonic

Name	Gnomonic
Model	Azimuthal
Type	n/a
Meridians	Polar: Straight lines radiating from point of tangency Oblique: Straight lines Equatorial: Straight lines
Parallels	Polar: Concentric circles Oblique: Ellipses, parabolas or hyperbolas concave to poles Equatorial: Ellipses, parabolas or hyperbolas concave to poles
Spacing Meridian	Polar: Equal and increases away from poles Oblique: Increases very rapidly away from center Equatorial: Increases very rapidly away from
Spacing Parallels	Polar: Increases very rapidly away from center Oblique: Increases very rapidly away from center Equatorial: Increases very rapidly away from
Linear Scale	Linear and area distortion are very large away from the center
Specialties	Straight lines are great circles (unique to this projection)
Uses	Seismic work (waves travel in great circles) Navigation
Example