Preliminary Gemini 4 Crew Debriefing, Part II, 1965

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222
White
McDivitt
White
notes.
Ed tended to use different types of
horizons, dependent upon the type of filter he
had on.
Why don't you discuss that a little bit~
I tended to feel that the bottom of the bright
air glow layer gave me a little finer defined
horizon for a no-filter operation.
When I put
the blue filter on, though, I didn ' t have much
horizon at all.
When I put the green filter on,
it gave me, as far as the top of the air glow is
concerned, a better horizon to measure to.
I
thought that the horizon was certainly not a
very defined point to measure to, and I think
accuracy would be lost in trying to measure to
a horizon like this . It 's just pl ain hard to
take a fuzzy old horizon and try to make an
accurate measure to it .
That 's exactly the kind
of horizon that you've got at night .
I concur.
There must have been at least a couple
of minutes of fuzziness in that horizon, and I
don't think that you would ever expect to
measure to the horizon within a couple of
minutes.
Do you?
No.
You'd have to calibrate yourself down pretty
COt~FIDE~~TIAL