SURVEY OF MASSACHUSETTS. 61 
And it was the opinion of Dr. Bowditch, that “ this longitude is more accurately ascertained 
than that of any other place in the United States.” 
From the observations on the occultations of « Tauri, a star of the first magnitude, on 
August 21st, 1829, and January 5th, 1830, made in many of the observatories of Europe, 
and in this city by myself, I deduced the longitude of the State House to be 4° 44" 14°.6. 
And from the observations made at Greenwich and at Dorchester, by a friend, and at Pro- 
vidence by myself, on the great eclipse of the sun, of May 15th, 1836, [deduced 4" 44” 19'.6. 
The mean of these three observations is 16°.3, or only three-tenths of a second less than 
the longitude determined by Dr. Bowditch; and the mean of the nine observations is 
only one-tenth of a second less, a quantity toosmall to be noticed. 
I therefore state the longitude of the State House (west from the Royal Observatory at 
Greenwich) to be 4" 44™ 16%.6, or, in degrees, 71° 4’ 9'.0. 
Amherst, (College Chapel.) For the Latitude. 
1832, October, 26 altitudes of the © gave - “ - “ . - 42° 93’ 11".4 
1834, August, 14 66 a Aquilae - . - - « - - 13 .6 
“ 14 sé @ Urse Minoris | - - - . - 13 8 
66 4 66 66 66 a . ge é . ~ 13 .2 
«“ 12 « — B Ceti - < i é < . 12 .5 
6 9 es o Urse Minoris - - - - - - 12 .0 
1836, ‘c 10 6 66 66 . 2 ; . = ll .4 
‘“ 10 «  q@ Aquile - - - - - - . 11 9 
es 10 . a Urse Minoris - - “ r - 14.8 
62 " © and Southern Stars - - - - - 12 .19 
47 66 66 Northern i ee a . - - 1a:.11 
Mean of 109 observations, “ . ‘s s 2 - 42 22 12.6 
Amherst, (College Chapel.) For the Longitude 
1832, October, By 2 chronometers east of Mansion House, Northampton, - : 0™ 278.76 
1833, October, 2 Uy “ “ “ “ - - - 28 .42 
66 2 66 66 “ 66 6c . - 28 .27 
1834, August, 2 " + “ “ “ - - - 27 11 
6é 2 66 66 66 66 é - « 26 .88 
1835, August, 4 “ «“ «“ «“ “ : . . 27 .69 
September, 4 ee 66 66 6 66 a . 28 .69 
1836, August, 3 “ 66 6“ 6 6c . - - 28 .36 
Mean of 21 chronometers, east of Mansion House, Northampton, - - — 27.96 
Longitude of Northampton, - - ™ - . « +6 17.72 
Longitude of Amherst College Chapel, . - - - - +5 49.76 
TI. 
1832, October, By 2 chronometers west of State House, - - - - + 5™ 50°.03 
tl. 
1832, October, By 2 chronometers west of Antiquarian Hall, Worcester, - - s+ 2m 53*.82 
| Longitude of Ant, Hall, Worcester, - - - - - + 2 56.08 
| Longitude of Amherst College Chapel, - - - - - +5 49.90 
By 2 chronometers compared directly with State House, - - : + 5” 50°.03 
9 66 tc ‘ ‘© Worcester, : . “ - 49 .90 
21 a “ “ «« Northampton, - : : 49.76 
Mean of 25 chronometers, - - - - : . 2 +5 49.79 
Or from Greenwich, - - - - : 450 6.39 
VOL. IX.—19 
