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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Reliable Index Correction to a Tenth Minute of Arc
From: Brad Morris
Date: 2010 Mar 3, 09:57 -0500
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 Brad "Confidentiality and Privilege Notice The information transmitted by this electronic mail (and any attachments) is being sent by or on behalf of Tactronics; it is intended for the exclusive use of the addressee named above and may constitute information that is privileged or confidential or otherwise legally exempt from disclosure. If you are not the addressee or an employee or agent responsible for delivering this message to same, you are not authorized to retain, read, copy or disseminate this electronic mail (or any attachments) or any part thereof. If you have received this electronic mail (and any attachments) in error, please call us immediately and send written confirmation that same has been deleted from your system. Thank you."