Sou

In order to understand the phenomena exhibited by the Moon.
the most careful and accurate observation of every part or the
lunar disk is required at all the various periods of her libra
tion The position of remarkable spots must be determined
with the most rigourous exactitude, as it is found. from
the change or situation relative to surrounding appear
ances. consequent upon the Moons phases, that a spot
clearly distinguishable by the naked eye upon her sur
face when at the rull.will be with difficulty discerned
even by the glass towards the last quarter.
The appearances observed on the Moon's surface are
caused either by diference or level.or by differ
ence or the intensity or the light. The light ref
lected from the surface of the Moon is plainly
seen to be of different shades: although the light
er parts are generally the mountains.& the dark
er ones the low plains still careril observations
have shown that this is not always the case.
but that, the streaks of light which at the full
surpass in brilliancy all the adjacent parts.some
times exist entirely independent or mountains
and extend alike over heights and valleys with
out being affected by them. Besides difference
in intensity or the light. colours specifically differ
ent may be observed particularly green.sometimes
a colour or a reddish tint.at others avellowish brown.
The elevations of the Moon are in general or a much
more precipitous nature than those of the earth. In the
plate the edges or the steeper craters. more especially
those of small extent. are generally shown by a plain line
the narrow defts or ravines by paralel lines without a cross
tint. The middle edge or the Moon. ie. the great aarde which
in the mean libration seperates the hemisphere which is visible
From that which is invisible is necessarily delineated in profile.
Chains of mountains. or mountainous regions or any importance.are
named after the mountains of the earth.and the various spots after
distinguished men as annexed. To avoid confusing the objects in the
plate by a profusion of figures the Moon's surface is divided into four
parts, the numbering or the spots in each commencing with unit.

L

T

3 Ritter
4 Godin

5 Rhancus
6 Schubert
7 Apollonius
8 Dionysius
9 forippa
10 Ariadaus
11 Triesnedker
12 Firmicus
13 Tarantius
14 Arago
15 Silberschlag
16 Neper

17 Sosigencs

18 Julius Caesar

19 Boscorid

20 Hoinus

21 Ukert
22 Azou
23 Condorcet
24 Ross

In order to understand the phenomena exhibited by the Moon.
the most careful and accurate observation of every part of the
lunar disk is required. at all the various periods of her libra
tion. The position of remarkable spots must be determined
with the most rigoureus exactitude, as it is found, from
the change or situation relative to surrounding appear
ances. consequent upon the Moons phases, that, a spot
clearly distinguishable by the naked eye upon her sur
face when at the full will be with difficulty discerned
even by the glass towards the last quarter.
The appearances observed on the Moon's surface are
caused either by difference of level.or by differ
ence or the intensity or the light. The light ref 10
lected from the surface of the Moon is plainly
seen to be of different shades: although the light
er parts are generally the mountains.& the dark
er ones the low plains. still careful observations
have shown that this is not always the case.
but that, the streaks of light which at the full
surpass in brilliancy all the adjacent parts.some
times exist entirely independent or mountains
and extend alike over heights and valleys with
out being affected by them. Besides difference
in intensity of the light. colours specifically differ
ent may be observed.particularly green.sometimes
a colour of a reddish tint.at others ayellowish brown
The elevations of the Moon are in general or a much
more precipitous nature than those of the earth. In the
plate the edges of the steeper craters. more especially
those of small extent.are generally shown by a plain line
the narrow certs or ravines by paralel lines without a cross
tint. The middle edge or the Moon. i.e. the great aarde which
in the mean libration seperates the hemisphere which is visible
from that which is invisible is necessarily delineated in profile.
Chains of mountains. or mountainous regions of any importance.are
named after the mountains of the earth.and the various spots after
distinguished men.as annexed. To avoid confusing the objects in the
plate by a profusion of figures. the Moon's surface is divided into four
parts. the numbering of the spots in each commencing with unit.

Sinus
Medii

Pala Nebularum

Nort

49 Le Monnier
50 M.Hadley
51 Aratus
52 M.Brudley
53 Hahn
54 Berosus
55 Tralles
56 Burkhardt
57 Geminus
58 Bernouilli
59 Posidonius
60 Autolycus
61 Aristillus
62 Gauss
63 Messala
64 Berzelius
65 Franklin
66 Calippus
67 Theaetetus
68 Cassini
69 Hook

70 Schumacher
71 Strave
72 Cepheus

25 Maver 26 Kraft 27 M.Huygens 28 Pytheas 29 Seleucus 30 Lambert 31 Euler 32 Aristarch 33 Herodot 34 Timodharis 35 Lahire 36 Diophantus 37 Briggs 38 Ardumedes 39 Helicon 40 Carhni 41 Delisle 42 Wollaston 43 Lichtenberg 44 Flugh Beigh 45 Lavoisier 46 Pico

47 Prom Laplare 48 Heracides

24 Longomontanus 56 Mercator

IV