Gemini 7 Technical Debriefing, 1965

Text

This text came with the file. It may have mistakes. When the text and the image disagree, the image is right.

153
we had to read the digital clock to get an exact time
of the reading, the reflection from the Moon, all that
stuff complicates visual sightings.
Borman
Row about picking out a proper horizon? You even
had trouble doing that. What horizon were we going to use?
Lovell
That is right.
We don't know what horizon we are going
to use.
Borman
The horizon is dependent upon the Moon.
Lovell
So sextant sightings are going to be very difficult.
Borman
And the accuracy of this instrument, as advertised,
is phenomenal.
But the accuracy to what? If we
do not
know what horizon we are measuring to. Did you mention the
fact that the green filter cuts out everything?
Lovell
Well that is right. Yes, the green and blue filters, one
of the modes as a matter of fact, was to use the green
filter for the horizon. Unfortunately you stick the green
filter in there and then look for the horizon and it is
gone.
Borman
Everything is gone.
There is nothing. All you see are
the stars up above, you do not see any horizon.
Lovell
So the filter idea was useless as far as the sextant goes.
Borman
Also the blue filter, you stayed dark adapted and then
tried the blue filter in daylight as was requested.