Gemini 4 Experiment Debriefing, 1967

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below the horizon, I thought that was a good place to look for small objects. When we say small objects, they have to have large identifying features near them; maybe if we're going to start looking for something like the -

. . . . . . . . . . . . . (could be a cloud)

-the Red Sea . . . . . . . . 30° below the horizon, I think you could probably start picking it up. This is below the apparent horizon. This is below the local horizontal.

Right.

As to water and land you say it may be 20 to 30°. As for clouds, perhaps about the same, or maybe further up?

A little further up.

Further up.

To tell the difference between a storm and just a sheaf that's so far off that you can't tell if it's just a sheaf of clouds or is it honestly a storm gathering.

You see as you get farther out there, 0° below the horizon . . . when you're looking like that you don't know the difference. One degree either side covers 100's of miles, so if you get right down below you one degree either side only covers a couple miles. So, if you get too close to the horizon, you're really not confining any point out there.-

The point is, if I set up for say 30° or 20° below the horizon, would that be a good place to give a man a value on to set up?

I think 20° would be (easier, yes.)

I think 20° would be easier.

30°?

More than that.

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