Hermann Carl
Vogel

Astrophysikalische Observatorium Potsdam (Physics Tree)




Karl Wilhelm
Valentiner

Universität Heidelberg


Max
Wolf

Universität Heidelberg (Physics Tree)


Johannes Franz
Hartmann

Kuffner-Sternwarte


Karl
Schwarzschild

Astrophysical Observatory Potsdam (Physics Tree)


Georges
Lecointe

Royal Observatory of Belgium


George A.
Van Biesbroeck

Yerkes Observatory


Arthur
Schuster

University of Manchester (Physics Tree)


Horace
Lamb

University of Manchester (Physics Tree)


Robert Alfred
Herman

Cambridge (MathTree)


Ernest William
Barnes

Cambridge (MathTree)


Edmund Taylor
Whittaker

Cambridge (MathTree)


Alfred North
Whitehead

Harvard (Neurotree)




Otto
Struve

UC Berkeley



Robert F
Garrison

University of Toronto
(Options)

Robert GarrisonX