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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Ratio vertical distance approximations
From: Doug Royer
Date: 2003 Apr 21, 17:25 -0700

```I've been thinking over the last few days about a method to measure vertical
distance off an object using ratio.I'll throw this out to you guys to see if
you think it has merit.I was thinking and schemeing while out in the
mountains about measureing distances by vertical sextant angles.I'm thinking
of useing unknown heights of objects over unknown distances.I was wondering
if one could use the ratio of a known height and distance and an unknown
height to find the distance to the unknown object.
Here is what I was thinking: Take a rod of a measured height (say 24
inches)and set it a known distance(say 60 inches)from yourself.Use the
sextant to measure the angle.Pick an object in the distance(you don't know
its' height or distance from you)and take its' angular measurement.By useing
the ratio of the 2 do you think it possible to calculate the distance?I'll
do some work on this tonight and see if I can get it to work in theory and
all day today.

```
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