Tähtitieteellinen yhdistys Ursa

Amateur astronomical association in Finland, founded in 1921 by Yrjö Väisälä and several other young scientists. According to their website, "Ursa's primary focus is to spread information about astronomy and amateur astronomy and offer an up-to-date, comprehensive view of the universe to its members and the general public." Series: Ursan julkaisuja In Swedish: Astronomiska föreningen Ursa In English: Ursa Astronomical Association Address: Tähtitieteellinen yhdistys Ursa ry Kopernikuksentie 1 00130 Helsinki