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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Results with mirror AH
From: Bill B
Date: 2014 Apr 28, 20:07 -0400
From: Bill B
Date: 2014 Apr 28, 20:07 -0400
It seems to me both accounts are lower limb. Words are the problem. "Mirror" instead of "liquid", and "double reflected" instead "sextant sun." It is an artificial *horizon*, so the same as a lower limb sun observation. Simply put, in a lower limb AH sight the image from the view through the glass side (left) is tangent to the bottom of the image from the sextant mirrors (right side). In six words a LL is, sextant-mirror image over glass image. On 4/28/2014 6:46 PM, Sean C wrote: > "...the sights I reduced [...] were Lower Limb of the sun, that is to > say the 'mirror sun' was BELOW the 'sextant sun'..." -Alan > > I think this is the problem. From the Davis instructions: > > "In the case of the Sun or Moon, the bottom of the double reflected > image is brought into coincidence with the top edge of the image on the > liquid for a lower limb observation. For an upper limb observation, the > opposite sides are brought into coincidence." >
