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Butterflydiagrams of the Sun Since 1976 I observe the Sun systematicly. With every observation I also count the number of sunspots and do I make an exact positiondrawing. From 1980 this happens with a 90mm/f1300mm refraktor. The drawings are 150 mm in diameter with an accuracy of 99%. This means that the drawaccuracy on the centre of the sundisk is secure within 1 heliographical degree. A ...
home-1.tiscali.nl/~slooten/
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