div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=document1921-greenwich-photo-heliographic-results-d-viii-introduction-to-greenwich-photo-heliographichtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: 1921 Greenwich Photo-Heliographic Results · D viii INTRODUCTION TO GREENWICH PHOTO-HELIOGRAPHIC RESULTS 1921 where L is the heliographic longitude of the centre of the disc The loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsinreader034viewer20220423215f0b19957e708231d42ed901html5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=document1921-greenwich-photo-heliographic-results-d-viii-introduction-to-greenwich-photo-heliographichtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: 1921 Greenwich Photo-Heliographic Results · D viii INTRODUCTION TO GREENWICH PHOTO-HELIOGRAPHIC RESULTS 1921 where L is the heliographic longitude of the centre of the disc The loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader034fdocumentsinreader034viewer20220423215f0b19957e708231d42ed901html5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=document1921-greenwich-photo-heliographic-results-d-viii-introduction-to-greenwich-photo-heliographichtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: 1921 Greenwich Photo-Heliographic Results · D viii INTRODUCTION TO GREENWICH PHOTO-HELIOGRAPHIC RESULTS 1921 where L is the heliographic longitude of the centre of the disc The loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII=...