Describes a slide rule Moon phase calendar accurate over 8000 years into the past or future, and provides other methods of computing astronomical information.
Moonstick Information Site
Moonstick Co. - manual visual calculators for astronomy, timekeeping, and computation
2024-06-12
Science, Astronomy, Solar System, Earth - Moonstick Information Site. Describes a slide rule Moon phase calendar accurate over 8000 years into the past or future, and provides other methods of computing astronomical information.