Calculator of twilight, sunrise and sunset for aer

Made:
United States

Calculator of twilight, sunrise and sunset for aeronautical use in circular slide-rule format with cursor, north polar projection, type A-1, made in America by Allegheny Plastics Inc., ink stain

Details

Category:
Mathematics
Object Number:
1990-620
type:
slide rule (astronomy)
credit:
Tesseract
status:
Permanent collection

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