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OROLOGIUM 
Nebula £*/ OR'ON 
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CAPRICORNUS' 
PHCENIX 
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AQUARIU 
SCULPTOR 
PEGASUS 
Mira 
No. 2101 
IVLeo 20 cents 
EXPLANATION FOR USE OF CHART. 
Mount the chart on a light drawing board. Pivot a string in 
the center and fit a loop in the end of the string outside of 
the circumference. This string represents the Meridian .< 
of the observer. Desiring to know where the differ- 4 
ent Heavenly bodies should be looked for at 
any time, plot the position of the Sun, A V 
Moon, and Planets by means of the Right t j sf- .r 
Ascension and Declination taken from the ^ jf- 
Nautical Almanac. The position of the Sun 
will indicate at once what Stars and Planets 
will be above the Horizon and those be¬ 
low it at sunset, with certain modifica- i 
tions, due to a further considera- 
tion of latitude and declination, 
Wishing to know what bodies f/ 
are at or near the Meridian 
at a certain hour, say 7 p. 
m., get the Right Ascen- M, F N 
sion of the Mean Sun ^ 
for that time, add 7 
hours.andwehave 
the Local Siderial 
Time or Right 
Ascension of 
. . . 
the Merid¬ 
ian. 
EXPLANATION FOR USE OF CHART (Continued). 
Place the string in this position; it will then be seen at once what 
bodies are on or near the Meridian, as well as those lying to 
the eastward and westward of it. Plot the position of 
the Zenith by its Declination which is equal to the 
y 'y Latitude of the observer. Since the Horizon is 
90° from the Zenith, the approximate altitude 
C of any body on the Meridian may readily 
be seen. The position of the well-known 
bodies, the Sun and Moon will assist greatly 
in identifying unfamiliar Stars,and the Planets, 
not easily followed in their ever-changing 
positions, can readily be recognized by 
their location in regard to well-known 
constellations, the Sun and Moon, 
or with reference to the Meridian 
at any time. The chart, being 
a projection of the fixed 
stars on the plane of the 
Equator, is eccentric to 
the Zenith of the ob¬ 
server in every case 
when not located 
at the Pole. Re¬ 
member that 
VA 
eastward is al¬ 
ways in the 
• TC ^ 
^ v 
k direction of 
\ theincreas- 
£ \ 
\ ing Right 
\ Ascen- 
* 
sion. 
V* 
V \ 
SYMBOLS. 
SUN. 
MOON 
MERCURY 
VENUS, 
MARS. 
JUPITER, 
SATURN. 
URANUS. 
NEPTUNE. 
MAGNITUDES! 
First 
* 
Soeouil 
* 
Third 
® 
Fourth 
0 
Fifth 
* 
Sixth 
* 
Hirehtnpfon. 1-lC.publOitiiil Me /A,/,.../,,,/,/,,, flltht 
wirier the authority <*t' Me srrntiTAHY or rut. AVI I > 
Price 20 cents 
No. 2101 
