Peter Carl Ludwig Schwarz

Following assignment by Friedrich Georg Wilhelm Struve as a field expedition astronomer (1849–1853) to study the Amur River, The Siberian expedition went into central Asia, southeastern Asia, and northern China. Some of the routes travelled were as long as 10,000 miles. Utilizing his prior Amur field knowledge of astronomy he would determine geographical positions of certain points (geodesy) for preparation of geographical maps. The information would later be used in planning the construction of the Trans-Siberian Railway systems and others in southeast Asia. The volumes reporting the results of the expedition were published in 1864. The separate tomes concerning the vegetation and wildlife reports were prepared by the expedition's botanist and zoologist Gustav Radde. ==Dorpat Observatory==

Ludwig Schwarz served as the Director of Dorpat Observatory to 1891, During his tenure in later life he conducted studies of one third of the 10,000 celestial stars visible at Tartu. ==Legacy==

Radde's warbler, a leaf warbler bird that breeds in Siberia and winters in southeast Asia, bears a scientific name (Phylloscopus schwarzi) that commemorates Schwarz. The bird was described in 1863 by naturalist and fellow explorer Gustav Radde who served in the East Siberian Expedition of 1855 led by Schwarz. ==Gallery==

File:А М Хаген Обсерватория Дерпта.jpg|Dorpat Observatory. Painting by August Matthias Hagen, father-in-law to Schwarz. File:Radde's Warbler (Phylloscopus schwarzi) - Flickr - Lip Kee.jpg|Radde's Warbler (Phylloscopus schwarzi) File:Ludwig Schwarz 1870.jpg|Ludwig Schwarz, 1870.Painting by Julie Wilhelmine Hagen-Schwarz, his wife. ==Works==

His publications include: German: • Schwarz, Ludwig (1889); Eine Studie auf dem Gebiete der Practischen Astronomie; Dorpat. ::[English: A Study in the Field of Practical Astronomy]. • Schwarz, Ludwig (1887–1893); Beobachtungen, angestellt und herausgegeben von Ludwig Schwarz, Band 17-20; Kaiserliche Universitats-Sternwarte, Dorpat (Jurjew) ::[English: Observations made and published from Ludwig Schwarz, Volumes 17-20; Imperial University Observatory]. ==See also==