Tropical year
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- Introduction to Astronomy and Astrophysics I Lecture 3
- Calculations of the Tropical Year and Precessional Cycles
- Ancient Astronomy
- Continued Fractions and Their Application to Calendars by D.B
- Aspects of Time in Physics Don N
- Orbital Spin: a New Hypothesis to Explain Precession of Equinox—The Third Motion of Earth
- Time and Space
- Copernicus's Heliograph at Olsztyn
- Solar and Sidereal Time
- Three Examples of Ancient “Universal” Portable Sundials
- Physics of Time
- Ay 1 – Lecture 2
- Ibn Yūnus' Report on Early Islamic Observations for Determining The
- Product Information Helios Sundial
- Year and Subdivisions A. AD, BC, CE, And
- Mind the Gap Sundials and Leap Years
- Tropical Year
- Astronomy in Timekeeping and Navigation