Talk:Regiomontanus

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The first european observatory was built by Regiomontanus in the Citadel of Oradea (NW of Romania near the border with Hungary) near the Bishop Palace in the 7th decade of XV century. He also write in this period and in this city the first ephemeridis table. In this table "Tabula Varadiensis" the position of celestial bodies are given by declination and hourly angle, so he need to transform from Horizontal Celestial Coordinates in Hourly Celestial Coordinates using spherical geometry. For calculate the longitude he establish the reference meridian (now is in Greenwich) in this citadel for 200 year till the Conference of Astronomers in Paris in 1667.