The FCG dictionary of commonly used FITS keywords

http://legacy.gsfc.nasa.gov/docs/fcg/common_dict.html

1. Keywords that describe the data or the FITS file itself:

    TITLE FILENAME FILETYPE ROOTNAME
    PROGRAM CREATOR CONFIGUR
    NEXTEND HDUNAME HDUVER HDULEVEL
    TLMINn TLMAXn TDMINn TDMAXn TDBINn
    TSORTKEY PROGRAM CREATOR CONFIGUR
    HDUCLASS HDUDOC HDUVERS HDUCLASn

2.  Keywords that describe the observation:

    SUNANGLE MOONANGL
    RA DEC RA_NOM DEC_NOM
    RA_OBJ DEC_OBJ RA_PNT DEC_PNT PA_PNT
    RA_SCX DEC_SCX RA_SCY DEC_SXY RA_SCZ DEC_SCZ
    ORIENTAT AIRMASS LATITUDE
    OBJNAME OBS_ID

3.  Keywords that describe the instrument that took the data:

    OBS_MODE DATAMODE
    APERTURE DETNAM FILTER FILTERn GRATING GRATINGn
    SATURATE

4.  Keywords that give the date or duration of the observation:

    TIME-OBS TIME-END DATE-END
    EXPOSURE EXPTIME TELAPSE ELAPTIME ONTIME LIVETIME

5.  Keywords that denote non-standard FITS keyword format conventions:

    HIERARCH INHERIT CONTINUE

6.  File checksum keywords:

    CHECKSUM DATASUM CHECKVER

7.  Hierarchical file grouping keywords:

    GRPNAME GRPIDn GRPLCn