Note longitude/expressed as degrees
xc,yc: center of map area (longitude,lattitude): xc: yc: x,y: coordinates as (longitude,lattitude) on map area x: y: extremes: averaged to xc,yc xmax: ymax: xmin: ymin:
all fields below are read only -- those above can be changed	// Set e to 0
Adjusted coordinates of x,y:     xadj:, yadj:
a: artificial equator declination = (1-sin(x - xc+90))yc
b: Δlongitude = cos(yc)(x - xc) cos(yc): x - xc:
c:Δlongitude along artificial equator = √(a2+c2)
d: Δlatitude = y-yc
e: = d>=a: (d-a);(-d-a)
f sign on X displacement; g sign on Y displacement
h = √(d2+c2)
i = arctan(d/c)
j = arccos( (h2+e2-b2)/ (2he)) h2+e2-b2 2he (h2+e2-b2)/ (2he)
k: = i+j
l = sin(k)e
m = cos(k)e
n = c-m
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