<a href="//commons.wikimedia.org/wiki/Francesco_Bianchini" class="mw-redirect" title="Francesco Bianchini">Francesco Bianchini</a>'s meridian line with solar disc at solar noon in the basilica Santa Maria degli Angeli e dei Martiri, Rome. Here the image is a few seconds before local noon at an angle of nearly 56 degrees from the zenith.
Wikibob
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