Clavius' 1560 and 1567 eclipse descriptions, combined with updated ephemerides, constrain the 1567 solar radius to <=696200 km and indicate no linear secular shrinkage but possible centennial oscillations.
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Analyses on Christoph Clavius' Reports of Total Solar Eclipses in 1560 and 1567: Key References for the Centennial Variations of the Earth's Rotation Speed and the Solar Radius
Clavius' 1560 and 1567 eclipse descriptions, combined with updated ephemerides, constrain the 1567 solar radius to <=696200 km and indicate no linear secular shrinkage but possible centennial oscillations.