NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: I and C pages of the NA
From: Bill B
Date: 2014 Sep 26, 15:34 -0400
From: Bill B
Date: 2014 Sep 26, 15:34 -0400
On 9/26/2014 12:46 PM, Gary LaPook wrote: > The i& c is simply a multiplication table for multiplying the hourly "d" > and "v" corrections for the minutes in the intervening period since the > prior hourly tabulated declination and "variation" from the assumed 15° > 00' increment per hour for the sun, planets and the assumed 14° 19' > increment per hour for the moon since the movements of these bodies is > not constant like the sun and aries. > Dale The Sun's apparent velocity is not a constant 15d, otherwise there would be no need for the equation of time. In modern almanacs this is figured into the Sun's GHA in the daily pages, therefore no "v" for the Sun is given. Any slight change in v for the Sun between NA hours is so minuscule it is lost in the system's noise, so not worth computing for celestial navigation.
