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    Re: Sun semidiameter
    From: Frank Reed CT
    Date: 2007 Apr 17, 19:08 -0700

    Herbert Prinz wrote:
    "The slightly larger value given in the N.A. is also correct. It is
    apparently based on a value of nominally 16' 01.18" at unit distance.
    This standard, which was also used in older astronomical almanacs is
    supposed to account for an irradiation effect. "
    
    Could this really be connected with the so-called irradiation
    correction? It's only a bit more than 1 second of arc larger than the
    more commonly used value. Surely the irradiation phenomenon was
    supposed to amount to several tenths of a minute of arc --15 to 20
    times larger than this measly arcsecond.
    
    -FER
    PS: I have a suspicion that the message from Herbert Prinz which I am
    quoting above did not distribute properly to some list members. It was
    NavList #2570 and you can read it here: http://www.fer3.com/arc/m2.aspx?i=102570&y=200704
    if you missed it.
    
    
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