3', longitude 170 deg. 4', and S. 30 deg. E.,
eleven or twelve leagues from Port Resolution. It is of a good height, with
an hilly surface; and more I must not say of it.[7]
Here follow the lunar observations by Mr Wales, for ascertaining the
longitude of these islands, reduced by the watch to Port Sandwich in
Mallicollo, and Port Resolution in Tanna.
Port Sandwich, ( Mean of 10 sets of ob. before 167 deg. 56' 33" 1/4 ) E.
( 2 ditto, at 168 2 37 1/2 ) long
( 20 ditto, after 167 52 57 )
( - - - - - - - -
( Mean of those means, 167 57 22 3/4
Port Resolution, ( Mean of 20 sets of ob. before 169 37 35 ) E.
( 5 ditto, at 169 48 48 ) long
( 20 ditto, after 169 47 22 1/2 )
( - - - - - - - -
( Mean of these means, 169 44 33
It is necessary to observe, that each set of observations, consisting of
between six and ten observed distances of the sun and moon, or moon and
stars, the whole number amounts to several hundreds; and these have been
reduced by means of the watch to all the islands; so that the longitude of
each is as well ascertained as that of the two ports above-mentioned. As a
proof of this I shall only observe, that the longitude of the two ports, as
pointed out by the watch and by the observations, did not differ two miles.
This also shews what degree of accuracy these observations are capable of,
when multiplied to a considerable number, made with different instruments,
and with the sun and stars, or both sides of the moon.
