[ 53 s ] 
for any one to keep his Eye upon that Part of the 
Ecliptic as the Globe is turned round, unlefs it be in 
fome remarkable Circle of Longitude 5 and it is not 
very eafy to know the Moon’s Place, unlefs at her 
Conjun&ion, Oppolition, or Quadratures. 
This fimple Apparatus fhews all the Varieties that 
can happen in the Riling and Setting of the Sun and 
Moon, which are very curious, efpecially about the 
Poles, where the Sun is prefent for one Half of the 
Year, and abfent for the other Half 5 the Moon in 
Winter fhining conftantly without fetting from the 
firft to the third Quarter, in the Sun’s Abfence; and 
in Summer the full Moon is never feen at the Poles 5 
for fhe fets at the firft Quarter, and rifes not till the 
third, fave what may happen on account of her Lati- 
tude. 
All the ‘Phenomena of the Harveft-Moon become 
very plain by this additional Parti and in making 
fome Trials I find, that, to fome- Places of the Earth,* 
the Moon will not differ above an Hour in her 
Riling for fifteen Nights together, but will differ fome- 
times 23 Hours in her Setting, within the Compafs 
of that fifteen Days 5 and for the next fifteen fne 
will fet within an Hour of the fame Time, and differ 
2 3 Hours in her Riling. This is taken in round Num- 
bers, but may be confider’d with more Exa&nefs by. 
thofe who are better acquainted with the celeftial 
Motions. I fhall only add,, that the Places of the 
Earth where thefe Phenomena happen, are thofe 
lying under the Polar Circles. 
XXIL 
