source : www.astronomynotes.com trigonometric parallax trigonometric parallax source : www.astronomynotes.com source : www.astronomynotes.com source : www.astronomynotes.com source : www.astronomynotes.com http://www.astronomynotes.com/starprop/s2.htm source : www.astronomynotes.com source : www.astronomynotes.com source : www.astronomynotes.com source : www.astronomynotes.com source : www.astronomynotes.com Messung von Sternentfernungen source : www.astronomynotes.com Distances -- trigonometric parallax trigonometric parallax nearby stars from opposite sides of the Earth's orbit parallax http://www.astronomynotes.com/starprop/s2.htm source : www.astronomynotes.com source : www.astronomynotes.com parsec Messung von Sternentfernungen source : www.astronomynotes.com http://www.astronomynotes.com/starprop/s2.htm