378 TRANS. OF THE ACAD. OF SCIENCE. 
Libra. The places of the planets, thus reduced, are indicated 
in the foregoing scheme, and put in crotchets 2 } 
The following is a calculation of the said planetary config. 
ration according to Lalande’s Planetary Tables, not an exaet, 
but an approximative one, because the latter is sufficient for the 
purpose, and because a more accurate calculation would 
produced a difference, ie of but two or three degrees. 
Only the place of the vo which, as we shall see, de- 
pends the correction of the ase Tables of the Moon; maa 
exactly calculated. The date in question is this: 
Julian year 1722 B. C., October 7th, 6h. P.T. ' 
ANCIENT OBSERVATION. HELIOCENTR. GEOCENTR. : | 
Saturn in++++M, 9°e—3e ™ 970 44’ ™, 29° : | 
Jupiter - eee +36 7° 30’ oS 1°? 41/ - a ‘ ss | 
a ATS -«es0e #% 0°—302 io ¢ bas 20/ 
Sun--+> wena 4 0? vs eee at Gs z 7 “(bs.20°27) 
Venus ++++-- 
S0Ceee 6 He FACTO. aces 
10°— A 26° 22/ 
Merci ---- c 030° (ret. O 12° 54’ ™, 6° a | 
All Se places of the planets observed 1722 B. Cc, ‘iti 
obvious, harmonize with the calculation except those of J rupl- 
ter and the Moon, of which the longitudes were ae 
er, ig to and this _— 
be discussed hereafter. Even the tak 
sury agrees w ‘Tables ; for it is "Enown that’ er 
; also in a later or former year. This obj 
is easy to be removed; for, as the Sun was. in Libra 
oe coi hao sverigare pet a 
er in erwin 
