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Table 21
WCS and celestial coordinates notation.
| Variable(s) | Meaning | Related FITS keywords |
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|
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| i | Index variable for world coordinates | |
| j | Index variable for pixel coordinates | |
| a | Alternative WCS version code | |
| p j | Pixel coordinates | |
| r j | Reference pixel coordinates | CRPIXja |
| m ij | Linear transformation matrix | CDi_ja or PCi_ja |
| s i | Coordinate scales | CDELTia |
| (x,y) | Projection plane coordinates | |
| (φ,θ) | Native longitude and latitude | |
| (α,δ) | Celestial longitude and latitude | |
| (φ0,θ0) | Native longitude and latitude of the fiducial point | PVi_1a†, PVi_2a† |
| (α0,δ0) | Celestial longitude and latitude of the fiducial point | CRVALia |
| (αp,δp) | Celestial longitude and latitude of the native pole | |
| (φp,θp) | Native longitude and latitude of the celestial pole | LONPOLEa (=PVi_3a†), |
| LATPOLEa (=PVi_4a†) | ||
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