ブライアン・メイのインスタグラム(brianmayforreal) - 11月12日 21時19分

Cassini's Meridian Line, anybody ? If you're not excited by Astro History Opportunities you can skip this. But here we are in the Basilica di San Petronio. And there, at our feet, pink arrowed in this pic) is the Meridian Line set there by master astronomer Gian Domenico Cassini in 1655. It's orientated exactly North-South, as Meridians have to be. And damned difficult that was to achieve in a Church which was aligned completely differently. The line just skirts the huge columns which support this giant place of worship. And up in the roof (also arrowed) is the hole through which the Sun will send a shaft of light on to the Meridian line at EXACTLY local astronomical mid-day. ( to be continued ... )

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