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Ursa Astronomical Association ((フィンランド語:Tähtitieteellinen yhdistys Ursa ry)) is the largest astronomical association in Finland. Ursa was founded on 2 November 1921. Founding members include a renowned Finnish astronomer Yrjö Väisälä. In 1926 Ursa established the Ursa Observatory in Kaivopuisto district of Helsinki. In 2007 the Tähtikallio Observatory & Education Center was established in Artjärvi, its current equipment includes an Astrofox 36" Folded Newtonian Open tube telescope, an Alluna 16" Ritchey-Chrétien telescope, a Meade 16" LX200GPS Schmidt-Cassegrain telescope, a Sky-Watcher ED 120mm refractor telescope fitted with a Baader AstroSolar Solar Filter and a piggybacked Coronado SolarMax 40 H-Alpha telescope. Ursa's primary functions include advancing amateur astronomy and astronomical education. They have also published a magazine ''Tähdet ja avaruus'' since 1971. Anyone interested in astronomy can join the 17,500-member organization. ==Sections== The organization has thirteen sections specialized in different aspects of amateur astronomy (and meteorology): * Solar section * Halo section * Instrument section * Atmospheric optical phenomena section * Clubs and organization * Lunar, planetary and cometary section * Mathematics and information technology section * Meteor section * Storm chasing section * Minor planet and occultation section * Aurora section * Deep sky section * Satellite section In addition, Ursa has two loosely organized hobby groups: * Variable stars * Observation conditions 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ursa (Finland)」の詳細全文を読む スポンサード リンク
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