Night Vision Current Research and Future Directions, Symposium Proceedings (1987) / Chapter Skim
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Introduction
Introduction
Pages 15-22
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From page 17... ...
On behalf of Colonel Davis, USAF/SAM Commander, I'd like to congratulate Colonel Tredici for doing an absolutely outstanding job in the world of aviation vision. Participation with the National Research Council's Committee on Vision has been a part of the activities of the Air Force and specifically the School of Aerospace Medicine for at least 40 years.
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From page 18... ...
You need to deal with how well does the eye see at night, how well have we selected the right crew person, and how well have we optimized the way in which he' s able to see and focus at night, through p roper equ ipment design. I congratulate Colonel Tredici and all the f ine people that are here today to put your best "eyes" together to develop night visual s tandards and perhaps a new night vision tester .
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From page 19... ...
This is a reasonable expectation at sunset and sunrise, when ambient illuminance values are 30 footcandles. However, in view of the low illuminance levels encountered at the beginning of morning and the end of evening civil twilight, about 0.3 footcandle, one would expect significant Supported in part by grant EY 03276 from the National Eye Institute and by a grant from the U.S.
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From page 20... ...
It is too dark to see the sea horizon precisely enough for determination of altitudes for navigation, but visually guided orientation should be possible under these conditions as well as some form perception in the peripheral visual fields. m e period when the sun is between 12 and 18 degrees below the horizon defines astronomical twilight.
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From page 21... ...
As a consequence, the sun's position changes rapidly with respect to the horizon and twilight is of relatively short duration. At 10 degrees north latitude (southern Philippines, Costa Rica, central Ethiopia)
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From page 22... ...
REFERENCES Explanatory Supplement to the Astronomical Ephemeris and the American , . Ephemeris and Nautical Almanac.
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