Castor (star) in their spectra, and all are flare stars. "α Geminorum" (Latinised to "Alpha Geminorum") is the star system's Bayer designation. Castor and Pollux are the two "heavenly twin" stars that give the constellation Gemini (meaning "twins" in Latin) its name. The name "Castor" refers specifically to Castor, one of the twin sons of Zeus and Leda in Greek and Roman mythology. The star was annotated by the Arabic description "Al-Ras al-Taum al-Muqadim", which translates as "the head of the foremost twin." In the catalogue of stars in the "Calendarium of Al Achsasi Al Mouakket", this star was designated "Aoul al
Leda (river) source rivers Sagter Ems and Ohe). The lower until the port of Leer are navigable for large (Class Vb) ships, a further 7 km until the mouth of the Jümme for Class II ships and a further 16 km until the Elisabethfehnkanal are navigable but not classified.. In East Frisia the Sagter Ems, a headstream of the Leda, is also known as the Leda. Leda (river) The Leda is a river in north-western Germany in the state of Lower Saxony. It is a right tributary of the Ems and originates at the confluence of the Sagter Ems and the Dreyschloot