Geodesic
Photographic Determination of Heliographic Coordinates of Sunspots Without Taking Double Photos
Publications of the Department of Astronomy, Tome 6 (1976), p. 65 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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The idea of the method is to achieve high precision in determination heliographic coordinates of sunspots, without taking double exposure photographs. For this purpose, with a level, the parallelity of one side of the photographic plate to the horizont is ensured. The moment of exposure is noted in UT.
Keywords: sunspots, heliographic coordinates, double photos 
@article{PDA_1976_6_a11,
     author = {Aleksandar Tomi\'c},
     title = {Photographic {Determination} of {Heliographic} {Coordinates} of {Sunspots} {Without}  {Taking} {Double} {Photos}},
     journal = {Publications of the Department of Astronomy},
     pages = {65 },
     year = {1976},
     volume = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PDA_1976_6_a11/}
}
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Aleksandar Tomić. Photographic Determination of Heliographic Coordinates of Sunspots Without  Taking Double Photos. Publications of the Department of Astronomy, Tome 6 (1976), p. 65 . http://geodesic.mathdoc.fr/item/PDA_1976_6_a11/