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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Emergency sun declination
From: Jim Thompson
Date: 2004 May 24, 20:02 -0300
From: Jim Thompson
Date: 2004 May 24, 20:02 -0300
From "The Seaman's Secrets" by John Davis, 8th printing in 1657: "There is another way most excellent for the finding of the Suns Declinationn at all times, that is to search by the Ephemerides the Suns true place in the Ecliptick for any time proposed whatsoever, and then by the Tables of Sinus the Declination is thus known: Multiply the Sinus of the Suns Longitude from the Equinoctial points of Aries or Libra, to which soever be nearest, by the Sinus of the Suns greatest Declination, and divide the Product by the whole Sinus, and the Arke of the Quotient is the Declination desired: but because Seamen are not acquainted with such Calculations, I therefore omit to speak further thereof, fith this plain way before taught is sufficient for their purpose". Jim Thompson jim2@jimthompson.net www.jimthompson.net Outgoing mail scanned by Norton Antivirus -----------------------------------------
