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--- Begin Message ---This video is only partly about sundials. https://schedule.wttw.com/series/54/NOVA/?tp=82542bbd-2867-4625-9c86-d4906d4da82b It is about a Senegalese astronomer leading a team to set up a arrays of telescopes to measure a star’s occultation by an asteroid to determine its size and shape prior to a flyby by a NASA mission. But the video also digresses extensively into sundials, astrolabes and little-known Senegalese megaliths and some background material on Islamic astronomical research and takes a side trip to Istanbul. All these are of personal interest to me. I lived in Senegal for three years and have spent time in Istanbul. There are some beautiful videos of Dakar, Istanbul and several mosques. Jack Aubert
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