r"""
Gnomonic
========

The point of perspective of the gnomonic projection lies at the center of the
Earth. As a consequence great circles (orthodromes) on the surface of the Earth
are displayed as straight lines, which makes it suitable for distance
estimation for navigational purposes. It is neither conformal nor equal-area
and the distortion increases greatly with distance to the projection center. It
follows that the scope of application is restricted to a small area around the
projection center (at a maximum of 60°).

**f**\ *lon0/lat0*\ [*/horizon*\ ]\ */scale*
or **F**\ *lon0/lat0*\ [*/horizon*\ ]\ */width*

**f** or **F** specifies the projection type, *lon0/lat0* specifies the
projection center, the optional parameter *horizon* specifies the maximum
distance from projection center (in degrees, < 90, default 60), and *scale* or
*width* sets the size of the figure.
"""
import pygmt

fig = pygmt.Figure()
fig.coast(projection="F-90/15/12c", region="g", frame="20g20", land="gray")
fig.show()
