Calculator of twilight
- 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