The Sleepwalkers (283 page)

"Letter
to
Longomontanus,
1605",
G.
W.,
Vol.
XV,
p.
134
seq
.

25

Astronomia
Nova,
IV
,
Cap.
45.

26

Loc.
cit.

27

"Letter
to
D.
Fabricus,
18.12.1604",
G.
W.,
Vol.
XV,
p.
78
seq
.

28

"Letter
to
D.
Fabricius,
4.7.1603",
G.
W.
,
Vol.
XIV,
p.
409
seq
.

29

Letter
to
D.
Fabricius,
18.12.1604
.

30

Astronomia
Nova,
IV
,
Cap.
55.

31

Ibid.,
IV, Cap. 56
.

32

Ibid.,
IV,
Cap.
58
.

33

1605;
G.
W.,
Vol.
XV,
p.
134
seq
.

34

Mysterium
Cosmographicum, Cap. 18.

35

Cf.
Insight
and
Outlook
,
London
and
New
York,
1949.

35a

Astronomia
Nova, Introduction.

36

Delambre,
Histoire
de
l'Astronomie
Moderne,
Paris,
1891,
Vol.
I,
p.
394.

37

"Third
Letter
to
Bentley",
Opera
Omnia,
London,
177985,
IV,
380.
Quoted
by
Burtt,
op.
cit.,
p.
265
f.

38

Thus,
for
instance,
in
Galileo
Dialogue
on
the
Great
World
Systems
,
it
is
Simplicius,
the
naïve
Aristotelian,
who
says:
"The
cause
[why
bodies
fall]
is
manifest,
and
everyone
knows
that
it
is
gravity";
but
he
is
promptly
rebuked
with:
"You
are
out,
Simplicius;
you
say
that
everyone
knows
that
it
is
called
gravity,
and
I
do
not
question
you
about
the
name
but
about
the
essence
of
the
thing.
Of
this
you
know
not
a
tittle
more
than
you
know
the
essence
of
the
mover
of
the
stars
in
gyration."
(Salusbury
transl.,
ed.
Santillana,
Chicago,
1953,
p.
250.)

39

10.2.1605;
G.
W.,
Vol.
XV,
p.
145
seq
.

40

Astronomia
Nova,
III
,
Cap.
33.

41

Ibid.,
III, Cap. 38
.

42

Ibid.,
I, Cap. 6
.

43

Max
Caspar's
introduction
to
his
German
translation
of
the
Astronomia
Nova,
Munich
and
Berlin,
1929,
p.
54.

Part
IV Chapter VII. KEPLER DEPRESSED

1

"Letter
to
Heydon,
October
1605",
G.
W.,
Vol.
XV,
p.
231
seq
.

2

"Letter
to
D.
Fabricius,
1.10.1602",
G.
W.,
Vol.
XIV,
p.
263,
seq
.

2a

"Letter
to
D.
Fabricius,
February
1604",
G.
W.,
Vol.
XV,
p.
17
seq
.

3

"Greetings
to
the
reader!
I
had
intended
to
address
thee,
reader,
with
a
longer
preface.
Yet
the
mass
of
political
affairs
which
keep
me
more
than
usually
busy
these
days,
and
the
hasty
departure
of
our
Kepler,
who
intends
to
leave
for
Frankfurt
within
the
hour,
only
left
me
a
moment's
time
to
write.
But
I
thought
nevertheless
that
I
ought
to
address
a
few
words
to
thee,
lest
ye
should
become
confused
by
the
liberties
which
Kepler
takes
in
deviating
from
Brahe
in
some
of
his
expositions,
particularly
those
of
a
physical
nature.
Such
liberties
can
be
found
in
all
philosophers
since
the
world
existed;
and
it
in
no
way
affects
the
work
of
the
Rudolphine
tables.
[This
refers
to
the
planetary
tables
dedicated
to
Rudolph
which
Tengnagel
had
promised
to
produce,
and
never
did.]
You
will
be
able
to
see
from
this
work
that
it
has
been
built
on
the
foundations
of
Brahe
...
and
that
the
entire
material
(I
mean
the
observations)
was
collected
by
Brahe.
In
the
meantime,
consider
Kepler's
excellent
work
...
as
a
prelude
to
the
Tables
and
to
the
Observations
to
follow
which,
for
the
reasons
explained,
can
only
be
published
slowly.
Pray
with
me
to
the
Almighty
and
all-wise
Lord
for
the
rapid
progress
of
this
much
desired
work
and
for
happier
days.
Franz
Gansneb
Tengnagel,
In
Campp.
Counsellor
of
his
Imperial
Majesty."

4

G.
W.,
Vol.
XV,
p.
131
seq
.

5

"D.
Fabricius
to
Kepler,
20.1.1607",
G.
W.
,
Vol.
XV,
p.
376
seq
.

6