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Practical astronomy during loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220504015f7ea6d2c6c6352e880917a7html5thumbnails2jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imageimg data-url=historical-astronomy-division-2016-11-08-gay-christiaan-huygenshtmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: Historical Astronomy Division · 2016-11-08 · gay Christiaan Huygens Kosmotheoros appears on p 1—14 at the end of the volume kelly John T Practical astronomy during loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220504015f7ea6d2c6c6352e880917a7html5thumbnails3jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 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src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220504015f7ea6d2c6c6352e880917a7html5thumbnails5jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imageimg data-url=historical-astronomy-division-2016-11-08-gay-christiaan-huygenshtmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: Historical Astronomy Division · 2016-11-08 · gay Christiaan Huygens Kosmotheoros appears on p 1—14 at the end of the volume kelly John T Practical astronomy during loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220504015f7ea6d2c6c6352e880917a7html5thumbnails6jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=7Page 7button div class=ts-imageimg 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src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220504015f7ea6d2c6c6352e880917a7html5thumbnails8jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=9Page 9button div class=ts-imageimg data-url=historical-astronomy-division-2016-11-08-gay-christiaan-huygenshtmlpage=9 data-page=9 class=ts-thumb lazyload alt=Page 9: Historical Astronomy Division · 2016-11-08 · gay Christiaan Huygens Kosmotheoros appears on p 1—14 at the end of the volume kelly John T Practical astronomy during loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentssitereader034viewer20220504015f7ea6d2c6c6352e880917a7html5thumbnails9jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=10Page 10button div class=ts-imageimg 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