An introduction to astronomy: designed as a text-book for the use of students in college. By Denison Olmsted ...

611:" lTItHt ]CAR'TIf.
1Rad..... 10.
Cot A. or tan 520 13' 10.1105786'T1anl 11S:M 230 28' 9.63t76106
S in 3 0to 03' 2 "..........................
1I! }. 9.7481892
O.........................';:"';;;
211. 1'6 318 20"'
31h. 43' 46" 35"'::;the time,after midnighlt, and of
course thlt time of rising.
Eix. 2. Requiried the time of sunrise at latitude 57o 2' 54" N.
whlen the sun's declination is 23~ 28' N.
Atns. 3lh. tI. 49s.
EIx. 3. Iow lowng is the sun above the horizon in latitude 58~
12' IN. when his declination is 180 40' S..Ams.. 35t8m. 52s.
134. Given the, Z.attitude qf the.place, and the Delie'nati7on
]f a heavenZlFy body, to dctef,i'nne its A/.ltitutd d nt.Aaimn, utlt
when oni the six o'clck hour circle.
-Let IWZO (Fig. 23) le the meridian of the place, Z tle zenith,
110 the horizon, S the place of thle object on tfle 6 o'clock hlour
circle Si', whltich of course g. 3.
cuts the equtator in the east and
west points, and S ttlhe verti-
cal circle passintg tlhrough tile
bodyc. lThen inI the rig}lt-angled
triantgle SBlA the given (qluantities are AS, whichl is thle /eeclination, and the arte Oii or
angle SA.Bi, the latitude of tlhe
place, to find the altitude:13S, /
and the azimulth 1130 or the t/
amplitude AB, whlich is its r
conple1 lmen t. N
Ex. 1.'What were tlle altitude and azimuitlh of' Arleturus,
whe n upon the six o'clock hour cilcle of Greenwich, lat. 51~
e)Cgrees Earc converted itto hours by tultiplying by 4 anlt dividingtl by 60.