Schlagintweit, Hermann von; Schlagintweit, Adolf; Schlagintweit, Robert von: Results of a scientific mission to India and High Asia: undertaken between the years MDCCCLIV and MDCCCLVIII, by order of the court of directors of the hon. East India Company (Band 1): Astronomical determinations of latitudes and longitudes and magnetic observations: during a scientific mission to India and High Asia (Leipzig, 1861)

GROUP I. ASSAM AND KHASSIA HILLS.

129

Latitude.

Sun, Upper Limb.
1856, February 5. Horizontal Circle. Vertical Circle.

P.M.

h m s o I II Of ll

1) 3 0 39 263 44 0 46 32 55

2) 3 9 41 266 52 20 46 20 0

3) 4 19 42 285 4 10 41 16 18

4) 7 23 40 325 8 10 11 26 40

O

( 754-6 millim. m „ ,. I 19-2 C,

Barom. \ . , Temp, ol Air j '- .■ ■ •

f 29-709 inches. (66-6 Fahr.

Calculated by Method I., from observations 1 and 4.

1. 4.

/ //

Refraction........ — 0 52 — 4 28

Parallax......... + 06 +08

Semidiameter . ..... — 16 15 — 16 15

Sum of Corr. . . . — 17 1 — 20 35

I II O I II

]) h corr. = 46 15 54 8 = — 16 9 10
4) h' corr. = 11 6 5 5' = — 16 5 53

Latitude N.........27° 32'-0.

The latitude by a preliminary determination of the Gr. T. S. (Thuill. App.) is
27° 31' 45", based on Wilcox and Bedford's Survey of Upper Assam. It perfectly
agrees with our results.

Time.

, h m s

Apparent Noon, deduced from the Altitude of the Sun, from observ. 1 2 52 5
„ „ „ observ. 4 2 52 6

We give the preference to the latter, on account of the altitude being 35° lower;
but, the values, being identical, also serve as a control of the observations.

h m s

Apparent Noon, adopted............................ 2 52 6

Equation of Time.............................. + 0 14 15

Mean Noon............ . . ...... 2 37 51

Longitude.

Our Chronometer giving in Upper Assam arbitrary time only, we adopt the
Longitude of Thuill. App......................... = 94° 57' 35" East Green.

I. 17