178 DOCUMENT
124 OCTOBER 1915
Dies ist ein
flagranter
Widerspruch.[3]
Ich zweifle daher
nicht
daran,
dass auch
die Theorie
der
Perihelbewegung an
dem
gleichen
Fehler
krankt.[4]
Entweder sind
die
Gleichungen
schon numerisch
unrichtig (Zahlenkoeffizienten)
oder
ich wende
die
Gleichungen
prinzipiell
falsch
an.
Ich
glaube
nicht,
dass ich selbst imstande
bin,
den
Fehler
zu
finden,
da mein
Geist
in dieser Sache
zu ausgefahrene
Geleise
hat. Ich
muss
mich
vielmehr darauf
verlassen,
dass ein
Nebenmensch
mit
unver-
dorbener
Gehimmasse
den Fehler findet. Versäumen Sie
nicht, wenn
Sie
Zeit
ha-
ben,
sich mit
dem
Gegenstände zu beschäftigen.
Mit
bestem
Gruss
Ihr
A. Einstein.
ALSX.
[80
061].
Unrelated
algebraic
calculations that have been
appended
to the
document,
probably
in Freundlich’s
hand,
are
omitted.
[1]The
year
is provided
by
the references
to
Naumann
(see
the
following
document
and Doc.
160)
and to
the
logical
contradiction in
Einstein’s
theory.
[2]Otto
Naumann
(1852-1925)
was
ministerial
director
for
university
matters in the Prussian Min-
istry
of
Education.
Einstein
sought
his
help
in
a
second
attempt
to free
Freundlich of
routine
astro-
nomical duties
(see
the
following
document).
The first
attempt
in
early February
1915,
in which Max
Planck had also
played
a
role,
is discussed in Docs. 53 and 54.
[3]Einstein wanted
a
Minkowski metric in
rotating
coordinates
to
be
a
solution
of
the
gravitational
field
equations
to
ensure
that inertial forces in
a
rotating
frame could be
interpreted
as gravitational
forces in
a
frame at rest. The contradiction arrived at
here
shows that the “Entwurf” field
equations
do not
satisfy
this
important
requirement,
contrary
to what Einstein had
come
to believe
firmly
in
early
1914
(see,
for
instance,
Doc.
5
and
Einstein
to Michele
Besso,
ca.
10
March
1914
[Vol.
5,
Doc.
514]).
The calculation outlined here had
been
done
by
Einstein
two
years
earlier. It
can
be found in his
manuscript
in
collaboration
with Michele Besso
on
the
perihelion
motion
of
Mercury
(Vol. 4,
Doc.
14,
[p.
41], [eqs.
268-274]).
In this
earlier
version,
Einstein made several numerical
errors,
as
a
result
of
which he had
come
to the conclusion that the “Entwurf” field
equations
do
reproduce
the 44-
component
of
a
Minkowski metric
in
rotating
coordinates. A version
of
the calculation free
of
errors,
which leads to the
result
given here, can
be found
on a
sheet
of
paper
that
was subsequently
used
for
the draft
of
a
letter to Otto Naumann
(see
the
following
document,
note
5).
[4]Einstein and Besso’s calculations
on
the
perihelion
motion
of
Mercury
(Vol. 4,
Doc.
14)
involve
the
same
iterative
approximation procedure
to
find solutions
of
the “Entwurf” field
equations
that is
used
in the
calculation outlined
in this document
(see Vol. 4,
the editorial
note,
“The Einstein-Besso
Manuscript on
the
Motion of
the Perihelion
of
Mercury,” pp.
346-349).
Einstein
used this
same
approximation
procedure
in Einstein 1915h
(Vol. 6,
Doc.
24).
124. To
Otto Naumann
[Berlin,
after
1
October
1915][1]
Brief
an
Naumann.
Letzter
Tage war
Herr
Dr.
Freundlich
von
der Sternwarte
N[2]
bei mir.
Er
erzählte
mir,
dass Sie ihm bei
Gelegenheit
einer
dienstlichen
Besprechung andeutungswei-
se
von
der
Möglichkeit
gesprochen
haben,
dass
er
für
einige
Jahre
von
seinen Ver-
pflichtungen
als
Assistent
der Sternwarte entbunden werden
könnte,[3]
ohne dass
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