Astronaut Scientific Debriefings, 1962-1963

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.S~ientific Debriefing
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~iach:' From that standpoint, is it better to retro in the da.yl~ft?
cqpper: . You could probably do .it at night, but it is preferabl~;- to do it in the day.
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Njte:
~'he next few comments are not interpretable, but 1t appe,-.rs eom one raised
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a ~question about the blue horizon band visible during daylight,
Co'pper:
This is ·predominantly blue· and if you have land masses or things that .
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you know are not blue - - - but this is about a two degrees thick band. It isn't
quite as thick as the band underneath - - - the last layer at night is thicker
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1 than this blue band and it is a brilliant blue.
Roach:
Then, is there some structure above the blue layer?
Cooper:
I never could see pattern structure above that. It is really not black.
This is any time you have earth shine. This is not a real sharply defined - - ­
There is a little blue gray going thru this area here. The overall band is real'
bright pale bluw and just faintly diffuse on this side.
(Explanation is made using
a sketch at the blackboard.)
Question: Is it diffuse on the upper side?
Cooper: It is not just a real sharp line or two different distinct colors. It does
diffuse very slightly,.
Question: .How wide is that band in angle?
,, Cooper: It is about 11iwo degrees.
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Huch:
I understand it gave a little problem in roll and yaw.
You said just as the
sun was sinking. _
Cooper:. That's right •. Tb.is is where I could tell where the sun had been.
back to t hat and
Iput the gyros to free and went into the automatic mode.
using sketch.)
Huch: , Wi th reference .to the sunset, do you estimate the time when the Zodiacal light'
sequence was started?
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