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    Re: Reliable Index Correction to a Tenth Minute of Arc
    From: Brad Morris
    Date: 2010 Mar 3, 09:57 -0500

    Hi George
    You wrote: "Presumably, the irradiation value of 0.6' + 0.6', recommended at one 
    time to
    be applied to upper-limb Sun observations taken at sea, presumed some
    telescope magnification. Anyone know what that was?"
    In the email entitled "Irradiation", 27Feb'10, I quoted Dutton.  Dutton states 
    1.2' for upper limbs of the sun, using 3X telescope.
    Best Regards
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