A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: Ken Gebhart
Date: 2017 Mar 17, 22:24 -0500
I tell people that we are reducing the large circle of equal altitudes to a segment that will fit on their charts.
On Mar 17, 2017, at 6:03 PM, Stan K <NoReply_StanK@fer3.com> wrote:Mike,
My interpretation is that you really are not looking for the definition of "sight reduction tables", just "sight reduction".
Here is the first sentence of the definition of "sight reduction" from The Norton Encyclopedic Dictionary of Navigation:
"The process of deriving from a celestial observation the information needed for establishing a line of position is called sight reduction."
It is not so much reducing the size of the chart, but you are reducing a larger amount of information to a smaller amount.
From: Mike Freeman <NoReply_Freeman@fer3.com>
To: slk1000 <slk1000---.com>
Sent: Fri, Mar 17, 2017 4:00 pm
Subject: [NavList] Definition Sight Reduction Tables
I know what they are and can use them but if someone asked me to give a definition of the term sight reduction I would be beat. Cannot help thinking it is to do with bringing the GP's of the HB's close to our DR therefore making a reduction of the size of the chart required to make a plot. From about a mile square to the size of a plotting sheet.Mike