New ΔT constraints from Ming-era Chinese eclipse records tighten prior estimates and indicate a steeper ΔT decrease between 1514 and 1567 than previously modeled.
Medieval Grand Maximum
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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.
citing papers explorer
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Variable Earth's Rotation Speed in the 14th to 16th Centuries: New {\Delta}T Constraints from Chinese Eclipse Records
New ΔT constraints from Ming-era Chinese eclipse records tighten prior estimates and indicate a steeper ΔT decrease between 1514 and 1567 than previously modeled.
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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.