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Ephemeris Lunae

36° 49′ 27.2″ N · 12° 00′ 44.8″ E

I · Luna hac nocte tonight

The moon tonight, as a worn seal, turned as the sky turns it

Reckoned at 21 h 30, Europe/Rome. The seal is turned as the eye sees it from the station — the bright limb at its true position angle, the zenith upward; when the moon is below the horizon it is shown as it will stand at meridian passage. Places from a low-precision lunar theory, to a few tenths of a degree; risings to a few minutes. Next syzygies in mean lunations of 29 d 12 h 44 m 02.9 s.

II · Lectio tabulae a reading from the plate

One macula per night, in the order of the plate — a rota, not an observation.

III · Tricenarium the thirty nights

IV · Nomina macularum insigniorum after Riccioli · after Hevelius

	Riccioli, 1651	Hevelius, 1647
A	Mare Crisium	Palus Maeotis
B	Mare Foecunditatis	Mare Caspium
C	Mare Nectaris	Sinus Athen. et Sin. extr. Ponti
D	Mare Tranquillitatis	Pontus Euxinus
E	Mare Serenitatis	Pontus Euxinus
F	Lacus Somniorum	Sinus Cercinites
G	Lacus Mortis	Montes Peuce
H	Palus Somni	Lacus Corocondametis
I	Mare Frigoris	Mare Hyperboreum
K	Mare Vaporum	Propontis
L	Sinus Aestuum	Mare Adriaticum
M	Mare Nubium	Mare Pamphilium
N	Mare Humorum	Sinus Sirbonis et Mare Aegyptiacum
O	Sinus Epidemiarum	Insulae Didymae
P	Oceanus Procellarum	Mare Eoum et Maris Mediterranei pars
Q	Mare Imbrium	Maris Mediterranei pars septentrionalis
R	Sinus Iridum	Sinus Apollinis
S	Sinus Roris	Sinus Hyperboreus

	Riccioli, 1651	Hevelius, 1647
4	Langrenus	Insula maior
8	Petavius	Petra Sogdiana
10	Endymion	Lacus Hyperboreus superior
13	Atlas	Pars Montium Macrocemniorum
15	Hercules	Pars Montium Macrocemniorum
20	Posidonius	Insula Macra
22	Theophilus	Pars Montis Moschi
27	Aristoteles	Mons Serrorum
28	Eudoxus	Mons Carpathes
29	Menelaus	Byzantium
33	Manilius	Insula Besbicus
39	Hipparchus	Mons Olympus
46	Archimedes	Mons Argentarius
47	Ptolemaeus	Mons Sipylus
48	Arzachel	Mons Cragus
49	Alphonsus	Mons Masicytus
53	Plato	Lacus Niger maior
54	Tycho	Mons Sinai
55	Eratosthenes	Insula Vulcania
59	Clavius	Desertum Hevila
62	Landsbergius	Insula Malta
64	Copernicus	Mons Aetna
66	Pytheas	Insula Sardinia
68	Bullialdus	Insula Creta
70	Reinhold	Mons Neptunus
75	Kepler	Loca paludosa
76	Gassendus	Mons Cataractes
78	Aristarchus	Mons Porphyrites
84	Pythagoras	ad Sinum Hyperboreum
86	Grimaldus	Palus Maraeotis

Transcribed from the plate's margins. Mayer engraved the disc with the meridian at the top, as the telescope shows it.

after Tobias Mayer's Tabula Selenographica, drawn 1748

The mark is Mayer's own figure from his Theoria Lunae (London, 1767), its letters removed: the moon at the top, the earth at the right, the sun at the left — investigatio in motum corporis L ad T relatum.

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