Ursa (Finland)
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Ursa Astronomical Association (Finnish: Tähtitieteellinen yhdistys Ursa ry) is the largest astronomical association in Finland. Ursa was founded on November 2, 1921. Founding members include a renowned Finnish astronomer Yrjö Väisälä. In 1926 Ursa established an observatory in Kaivopuisto district of Helsinki. Ursa's primary functions include advancing amateur astronomy and astronomical education. They have also published a magazine Tähdet ja avaruus since 1971.[1]