R. V. minor 3,256 miles.
Obliquity of the vortex, same time 26d 5' 0"
Polar angle of " " 17 41 47
True longitude of moon's node " 78 42 0
" inclination of orbit " 5 5 0
" longitude of the sun " 135 20 0
Moon's longitude " 169 44 0
" distance from node " 91 2 0
" distance from quadrature " 55 36 0
" true semi-diameter " 943
" right ascension " 172 30 0
" declination north " 8 42 20
Constant logarithm 2.889214
Arith. comp. of log. of 943 7.025488
Log. cos. arc. AR 9.914702 = 34d 44' 48"
1st. correction, + 2 45 0
2d. correction, - 1 14 15
--------------
Corrected arc AQ = 36 15 33
PA = 81d 17' 40"
PV = 26 5 0
P = 115 11 47
V = 63 34 26
A = 23 28 24
AV = 92 48 39
Q = 31 32 18
Complement of lat. = PQ = 48d 49' 41"
The latitude is therefore for
the earth, as a sphere 41 10 18
Correction for protuberance + 0 16 0
------------
True latitude of centre 41 26 18 north.
------------
Latitude of Ottowa 41 20 0 "
------------
Vortex passed 6 18 north of Ottowa.

[Illustration: Fig. 16]

As this was nearly a central passage, and as the influence was less
extensive than usual, on account of great atmospheric pressure with a
low dew point, the central disturbance could the more readily be
located, and was certainly to the north, and but a few miles. The
following is from the record of the weather:

_August_ 6th. Very fine and clear all day; wind from S.-W.; a light
breeze; 8 P.M. frequent flashes of lightning in the northern sky;
10 P.M. a _low bank