Gemini 4 Experiment Debriefing, 1967

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these targets of opportunity. Let's take the airglow for a moment here.

There's the night airglow, the twilight glow, and the day glow. Now there are no . . . . . . of day glow. That would take (perhaps a) second exposure, and you know where to look the next time around, and (you can do that forever.)

The twilight airglow might take 10 seconds to get . . . . . . . . .

And the night airglow you would want maybe 4 minutes. Now how do you feel about if that were programmed in with proper spectographs? Either hand-held or on the capsule. How do you feel about it? Taking a one-second exposure of the dayglow, a 10-second exposure of the twilight glow, and a 4-minute exposure of the nightglow. You're moving all the time, but the phenomena are pretty much the same during that period.

One second's no problem for us. Four minutes, you might have to be a little blurry.

I think you could probably, if you tried enough, you could probably get a 10-second . . . . . .

Four minutes—

Well of course the spectograph can . . . . . . . the time to permit a fair amount of motion, too.

You'd get something on the—

Schirra might have been able to take twilight, day, and night airglow. If the spectograph could stay in orbit, the person would have to go back in.

So shortly after that, the experiment was tried in a rocket and the rocket stabilization was a problem, too. With timing after four minutes, the exposure one did get the spectograph because the thing was able to point in this direction even though it did wobble a little bit.

I wouldn't think you'd want to hand-held a 4-minute one, I'll tell you

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