Gemini 4 Experiment Debriefing, 1967

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reasonable too, because uh, as you look in this direction you see the always the edge on air glow. But you also are looking through the air glow, as it is coming around; you're looking sort of taking two passes through the air glow instead of one, long big path and you are getting some light; and you are not getting very much light from the surface of the earth. So there is a kind of s (positive) contrast. There's a little bit of light here and . . . . up in here. Uh, McDivitt and White reported the same thing, although, McDivitt said that when we asked him what was moon condition, he says wasn't concerned about it because he could see the earth lem all the time. Well, fine, if the moon is out it is illuminating the earth's lem and perhaps the it was a little brighter than the air glow when there is no moon the other way around. But the point is there is a line of demarkation, at night. In fact, they prefer, the thing the line of demarkation is much more firm at night than in the daytime. The daytime, day the cloud situation is uh, very difficult but there're clouds at night, too, but uh, I think, one . . . effect of (night) one is not seeing too much detail. It seems that they, they may have something to say about this. Uh, uh, I haven't had much time to think about it but, uh, they did seem to feel that this, this, situation at night was a little bit sharper in the daytime, than in the daytime. Does the air glow vary in elevation?

Uh, yes, it does. Uh, but not very much. Not the uh, uh, the visable air glow and the, the green air glow, the green continues. Oh, I might make one statement. I, I think maybe by our not being careful enough early in the game, by separating the 5577 atomic oxygen green line of

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