Senest opdateret 1. marts
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Indbinding: Hardback with cloth back
Large format. Greenwich Photo-Heliographic Results. Results of Measures Made at the Royal Observatory, Greenwich, of Photographs of the Sun, Taken at Greenwich, The Cape and Kodaikanal. Contents (1941): Positions and Areas of Sunspots and Faculæ, General Catalogue of Groups of Sunspots, Ledgers of Groups of Sunspots (Recurrent & Non-Recurrent Groups), Total Areas of Sunspots and Faculæ, Observations of Solar Flocculi and Solar Flares Made with the Spectrohelioscope.
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