Mercator projection: celestial coordinates in
red -
native coordinates in grey
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Complication - native coordinates of the reference point differ for
different projections.
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Zenithal projections:
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Cylindrical, pseudo-cylindrical, polyconic, quad-cube and some
other projections:
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Conic projections:
Consequently, the mathematical relationship between the Euler angles
and CRVALi differs for
different projection types.
Nevertheless, the first-order behaviour of the celestial coordinate
system is similar at the reference point.
Additional FITS keywords:
PVi_m.
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