C 524] 
VIII >An Obfervcitionof an extraordinary Lunar 
Circle, and of two Parafelene’r, made at 
Paris, Oft. 20. 1747. N. S. and of the 
Eclipfe of the Sun, July 14. 1748. O. S. by 
Auguftine Nathaniel Grefchow, Memb. of 
the Royal Acad. Sciences at Berlin, 
Tranjlated from the French by T. S. MJD. 
Read Nov. 10 f~\CTOBER 20. at Night, the Sky 
J 74 8 - was darkened by a flight Fog, thro* 
which the Moon appeared of a firey-red Colour, till 
8 h . 4 o ni . when the Fog was thoroughly difperfed,and 
the Heavens were overcaft with a whitifhdreaky Cloud. 
At the fame time there appeared round the Moon a 
Halo (Tab. II. Fig . 7. ABCT>) accompanied with 
four other Segments of Circles, two of which EAF 
and GH of ten Degrees', were concentric, fo as to have 
their common Center at the Zenith. The Segment 
or Arch FPL on the North Side, of feven Degrees, 
was concentric with the great lunar Circle, and 
confequently had the Moon for its Centre 5 and in 
fine the Arch MCN, which faced the Horizon, was 
of twelve Degrees. 
Beftdcs thefe four Segments, what was mod re- 
markable was a Mock- Moon or Parafelene B, 
fhaped like a Mock-Sun or Parhelius . The Dia- 
meter of this Mock-Moon, tho 5 lll-determin’d, was 
of 35 Minutes at lead, with a Tad BP oppofite to 
the Moon, as the Tail of a Comet is oppofite to the 
Sun. This Tail varied in its Degree of Light from 
time to time, extending as far as the Arch FPL, 
which, 
