Preliminary Gemini 4 Crew Debriefing, Part II, 1965

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McDivitt
White
223
GOt'4 FI t,Et'4TI
close to measure.
You know it would be just
pure luck if you kept measuring properly to it.
Yes, the thing of it all is that even if Ed
got himself calibrated so that he would always
measure the same angle between the star and the
horizor--it wouldn't be consistent between One
person and another.
I'm not really sure how you
would ever go about measuring to this horizon
with any accuracy at all unless you had some way
that you could-instead of attenuating the light­
build it up in some way and then filter out one
particular line that happened to be an extremely
sharp line.
The horizon I like to measure
to
best was the top of t he dense air glow layer with
no filter. The next horizon I liked was the top
of the dense air glow layer with the green filter.
I liked least of all the blue filter , because it
just completely eliminated the horizon.
Yes, I don ' t think the difference between. the
clear and the green was enough to argue over a
preference between.
I thought maybe I had a
clearer one in the green, but I tended to take
far more measurements with the clear one, so
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