NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Eye problems and IE, IC
From: Bill B
Date: 2006 Jul 13, 17:53 -0500
From: Bill B
Date: 2006 Jul 13, 17:53 -0500
First of several tests run today.
I believe we can eliminate frame/mirror flex as a problem in the vertical
plane. The next post will contain vertical vs horizontal test with both
eyes, on and off the arc, and should help determine if the horizontal
readings differ due to frame/mirror flex in the horizontal position, and/or
my eye(s) are at fault.
I was surprised at the outcome of the upright vs inverted tests. When two
sets of experimental data agree *exactly*, I look for a problem. I rewound
the tape, wrote down the results again, and compared. It is what it is.
I was disappointed with the spread of the horizontal shots, especially
compared to the last round with SD's around 0.1'. I do not know what was
off today.
Order of observation was vertical upright, vertical inverted, horizontal
handle up, vertical upright, vertical inverted, horizontal handle down....
Bill
RIGIDITY TEST
Upright vs. Inverted
Astra IIB, Star Scope
13 July, 2006
15:06 to 15:40 EDT (breaks for cloud cover)
Hc 66d to 61d
Vertical Vertical Horizontal
Upright Inverted
32.0 31.8 31.7 HU
31.8 32.0 31.8 HD
32.0 31.9 31.3 HU
32.0 31.9 31.6 HD
31.9 32.0 31.4 HU
32.1 32.0 31.4 HD
32.0 32.1 31.7 HU
31.9 32.0 31.8 HD
Key:
VU (vertical upright)
VI (vertical inverted)
HU (horizontal handle up)
HD (horizontal handle down)
Mean Standard Deviation
VU 31.96' 0.09'
VI 31.96' 0.09'
HU 31.53' 0.21'
HD 31.65' 0.19'
HU+HD 31.59' 0.20'
VU vs VI = | 0.00' |
HU vs HD = | 0.18' |
HU+HD vs VU or VI = | 0.37' |
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