327 — 
COPIA 
Perrobamba, Sept. 12 thl911 
OBSEBVATION ON SUN FOR TIME AND AZIMUTH 
Tnstninient — 4" inomitain transit N." 7580 by C. L. Berger & Sons— 
Boston — Mass. U. S. A. 
'IVIcsíMiiif Tiiiii' Hor Circle Vert. Circle 
A. M. 0° O' O" beaiing-S. 8»30'E.MaK. 
Diiect 8 hr. 52'30" llOoóO' 43030' 
„ 8 54'10" llloOS' 43«52' 
Re\ersed „ 56'54" 111028' 44o29' 
„ „ 58'10" 111038' 44046' 
¡Sam 4 /85 41 44 445o01' 176037' 
Average 8 55 26 111"15'15" 44o 9'15" 
Refiaction -37" 
decl. sim = + 4" 30'48" k = 44o 8'38" 
9 
var. 57" X 1- hors = - 1'48' 
6 = 40 29'00" sin (s- a) = 9.726807 1/2 = 34° 34'29" 
fv =440 8'38" sin (s-b) 9.977898 ^n= 69° 08'58" 
(t, =-l405'26" sin(s-c) 9.372617 180o -A= no» 51'02" 
sum = 9.077322 Hor.circ= llP 15'15" 
.-. a = 850 31-00" sin S = 9.947011 diff. = 24'13" 
b = 45 51'22" K» = 0.869689 Bearing = S 80 30'00" E 
c=104 5'26" K = 0.434844 conected= 80 54'13"= 
'^S = 117 43 54 varation — East 
. • . cot 1/2 An = 0.161651 - 1/2 t = 21» 8'11" 
cot 1/2 t = 0.412742 t = 42ol6'22" are 
s-a= 32» 12*54 cot 1/2 q = 0.807461 t = 2 hr. 49'55 time 
s-b = 71 52 32 sum = 0.381854 ] '=9 hr. 10'545 A. M. 
s-c = 13 38 28 KsinS = 0.381855 J Eq. t=-3'27i „ 
Local mean time = 9 hr. 07'27"1 
s= 117 43 54' corrected watch = 8 „ 56'47" 
Diference = 10'40"1 time 
f significa "check" | or in are = 2o 40' 15 are 
• [ó confrontado ) from 75th meridian= 72o ^g- 58.5" w 
Wateh 8 hr. 55'26" a. m. 
coiiection as per observation upon return to Arequipa 
corrected 8 hr 56'47" assuming rate to have remained eonstant. 
hrs. 
Sept. 3rd watch error on 75th meridian time = 00 00' 00" 
„ 21st ,, „ „ ,, „ „ = slow 2' 42" 
T. A. CORRY. 
i 
