Calculator of twilight

Made:
United States
Calculator of twilight

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Calculator of twilight
Science Museum Group
© The Board of Trustees of the Science Museum

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