Ira
Young

Dartmouth


William
Harkness

U.S. Naval Observatory














Leo
Königsberger

Universität Heidelberg (MathTree)


Hugo
Gyldén

Stockholms observatorium


Max
Wolf

Universität Heidelberg (Physics Tree)












James Craig
Watson

University of Michigan


Edward Singleton
Holden

Lick Observatory


John M.
Schaeberle

Lick Observatory


Charles Sheldon
Hastings

Johns Hopkins (Physics Tree)


Samuel Pierpont
Langley

Smithsonian Institution


James Edward
Keeler

Lick Observatory (Physics Tree)


William
Chauvenet

Washington University


William
Harkness

U.S. Naval Observatory


Asaph
Hall

Harvard


Simon
Newcomb

Johns Hopkins


Edward Singleton
Holden

Lick Observatory


William Wallace
Campbell

Lick Observatory


Edward Charles
Pickering

Harvard College Observatory


Hermann Carl
Vogel

Astrophysikalische Observatorium Potsdam (Physics Tree)


Julius
Scheiner

Astrophysical Observatory Potsdam


Max
Planck

Universität Berlin (Physics Tree)


George E.
Hale

Yerkes Observatory


William
Chauvenet

Washington University


William
Harkness

U.S. Naval Observatory


Asaph
Hall

Harvard


Simon
Newcomb

Johns Hopkins


Edward Singleton
Holden

Lick Observatory


William Hammond
Wright

Lick Observatory


Henry A.
Rowland

Johns Hopkins (Physics Tree)


Heinrich
Rubens

Universität Berlin (Physics Tree)


Robert Williams
Wood

Johns Hopkins (Physics Tree)


John M.
Schaeberle

Lick Observatory


James Edward
Keeler

Lick Observatory (Physics Tree)


Edward Singleton
Holden

Lick Observatory


William Wallace
Campbell

Lick Observatory


Joseph Haines
Moore

UC Berkeley


Paul Willard
Merrill

Mount Wilson Observatory

Olin Chaddock
Wilson

Mount Wilson Observatory
(Options)

Olin WilsonX