Simon
Newcomb

Johns Hopkins




Hermann
von Helmholtz

Physikalisch-Technische Reichsanstalt (Neurotree)


Henry A.
Rowland

Johns Hopkins (Physics Tree)


John Krom
Rees

Columbia


Harold
Jacoby

Columbia






John M.
Schaeberle

Lick Observatory


William Wallace
Campbell

Lick Observatory


William Wallace
Campbell

Lick Observatory


Robert Grant
Aitken

Lick Observatory


Robert Williams
Wood

Johns Hopkins (Physics Tree)


William Wallace
Campbell

Lick Observatory


Joseph Haines
Moore

UC Berkeley


Leopold Friedrich Anton
Ambronn

Universität Göttingen










Alexander N.
Vyssotsky

Pulkovo Observatory










James Craig
Watson

University of Michigan


John M.
Schaeberle

Lick Observatory


William Wallace
Campbell

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


William Wallace
Campbell

Lick Observatory


Joseph Haines
Moore

UC Berkeley


Charles Donald
Shane

Lick Observatory

Carl Alvar
Wirtanen

Lick Observatory
(Options)

Carl WirtanenX