The flood runs to the northward and eastward, along shore, and the ebb in an opposite direction. The rise and fall is about nine feet perpendicular. High water at full and change IX.
[Sidenote: Variation of the compass.]
The variation of the compass, determined with great precision by the transit azimuth instrument, was 52' westerly.
The longitude of the Lyra's observatory at Napakiang by the mean of thirty-six lunar observations on both sides of the moon, is 127º 37' 28" east; by four chronometers, agreeing nearly, 127º 38' 30" east. The latitude is 26º 13' 39" north.
[Transcriber's Note: Crescent moons are denoted by [((] or [))]; a circle with a period therein is denoted by [(.)]
OBSERVATIONS MADE AT NAPAKIANG OBSERVATORY, GREAT LOO-CHOO ISLAND.
Lunars with a Sextant. Lunars with a Sextant.
[(.)] West of [((] *[Greek: a] Arietis, East of [))]
25th September, 1816. 4th October, 1816
[(.)] [((] 127º. 38'. 15" East. * [))] 127º. 31'. 00" East.
35 . 15 37 . 00
36 . 15 43 . 00
34 . 45 52 . 30
33 . 00 54 . 30
36 . 00 38 . 45
30 . 45 52 . 45
28 . 30 50 . 15
32 . 15 50 . 30
31 . 30 127º. 33'. 39" Mean 41 . 45
40 . 30
26th October, 1816. 34 . 15
43 . 15
[(.)] [((] 127 . 38 . 30 39 . 45
39 . 45 ——————
41 . 30 Mean by sextant 127 . 43. 20 * East of [))]
44 . 15
44 . 30 Lunars by Circle.
32 . 15 [(.)] West of [((]
33 . 00
31 . 45 4th October, 1816
31 . 15 [(.)] [((] 127º. 38'. 45"
27 . 30 127º 36'. 16" Mean 32 . 30
——————- ——————-
Mean by sextant 127 . 34 . 58
[(.)] W. [((] Mean 127 . 35 . 37 by circle.
Mean by sextant [(.)] west [))] 127º 34'. 58"
* East [((] 127 . 43 . 20
———————
Mean longitude by sextant [(.)] * [))] 127 . 39 . 9
by circle [(.)] * [((] 127 . 35 . 37
———————
Mean longitude by 36 lunars 127 . 37 . 28
Longitude by chronometers 127 . 38 . 30 east of Greenwich.