Yohkoh Pointing Instruments Summary					Page 1 of 2
					  M.Morrison Ver 1.3 (6-May-92)

Looking up at the sun
                                                    IRU-X       HXA-X     HXA-Y    TFSS-Y      S/C Point      SXT CCD and Image
                                N                                                              NORTH          
                               ***                 Smaller      Smaller   Larger   Smaller                        1023
                             **   **
                         E  *       *  W
                             **   **
                               ***                 Larger       Larger    Smaller  Larger                            0
                                S                                                              SOUTH

                HXA Scan  "Y" \  / 
                               \/
                               /\
                          "X" /  \ 

HXA ADA and PNT data designates X_ADDR and X_SCAN for sensor "X" with address 0 in south-east corner
HXA ADA and PNT data designates Y_ADDR and Y_SCAN for sensor "Y" with address 0 in north-east corner

SXT CCD Addresses:	1023		   0
SXT Image arrays:	   0		1023
SXT Command Address:	 255		   0 (value saved in "index.sxt.corner_cmd" goes from 1023 to 0)

S/C point                EAST            WEST
  IRU-Y:          	larger          smaller
  HXA-X:		larger          smaller
  HXA-Y:		larger          smaller
  TFSS-X:               smaller         larger

Conversions:
	2.45 arcsec per full resolution SXT pixel
 	2.075 arcsec per HXA pixel (14 micron pixel with 1391.5 mm focal length)
	0.08 arcsec per IRU data value
	1.94 arcsec per TFSS data value

					Yohkoh Pointing Instruments Summary					Page 2 of 2
					  M.Morrison Ver 1.3 (6-May-92)

To point to the east on the sun
	A. S/C Commanding
		* The S/C pointing must move to the east
		* The S/C command values get smaller
	B. SXT
		* The Sun will appear to move to the west on images
		* The sun center will move towards the right on reformatted data images, which is:
			- smaller CCD columns addresses
			- larger IDL image array column values
		  (it will move to the left on the mainframe SXTQLGG quicklook system - it is opposite of reformatted data)
	C. HXA
		* The limb addresses in ADA_DATA.HXA_ADDR(*,0) and ADA_DATA.HXA_ADDR(*,1) get SMALLER
		* The addresses in PNT_DATA.HXA also get SMALLER
	D. IRU
		* The Y data values get LARGER (this is DATA.IRU(1) in the PNT and ADA files)
	E. TFSS
		* The X data values get SMALLER (this is DATA.TFSS(0) in the PNT and ADA files)

To point to the north on the sun
	A. S/C Commanding
		* The S/C pointing must move to the north
		* The S/C command values get larger
	B. SXT
		* The Sun will appear to move to the south on images
		* The sun center will move down on reformatted data images, which is:
			- smaller CCD line addresses
			- smaller IDL image array line values
		  (it will move up on the mainframe SXTQLGG quicklook system - it is opposite of reformatted data)
	C. HXA
		* The limb addresses in ADA_DATA.HXA_ADDR(*,0) get SMALLER (X scan)
		* The limb addresses in ADA_DATA.HXA_ADDR(*,1) get LARGER  (Y scan)
		* The addresses in PNT_DATA.HXA(0) and PNT_DATA.HXA(1) get SMALLER
		* The addresses in PNT_DATA.HXA(2) and PNT_DATA.HXA(3) get LARGER
	D. IRU
		* The X data values gets SMALLER (this is DATA.IRU(0) in the PNT and ADA files)
	E. TFSS
		* The Y data values get SMALLER (this is DATA.TFSS(1) in the PNT and ADA files)