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

PROBLEMS ON THE TEZIRESTRImAL GLOBE. 25
69. Toafind the bearing and distance of two places: Rectify
the globe for one of the places (Art. 66);. screw the quadrant
of altitude to the zenith, and let it pass through the other
place. Then the azimuth will give the bearing of the second
place fi'om the first, and the number of degrees on the quadrant
of altitude, multiplied by 69- (the number of miles in a degree),
will give the distance between the two places.
Ex. What is the bearing of New Orleans from New York,
and what is the distance between these places?
70. To determine the difference of time in different places:
Bring the place that lies eastward of the other to the meridian,
and set the hour index at XII. Turn the globe eastward until
the other place comes to the meridian, then the index will show
the hour at the second place when it is noon at the first.
Ex. WVhen it is noon at New York, what time is it at London?
7 1. The hour being given at any place, to tell what hour it
is in any other part of the world: Find the difference of time
between the two places (Art. 70), and, if the place whose time
is required is eastward of the other, add this difference to the
given time, but if westward, subtract it.
Ex. What time is it at Canton, in China, when it is 9 o'clock
A. M. at New York?
72. To find the aGntc3ci,t the periowci, and the atipodes~ of
anyp clace: Bring the given place to the meridian; then, under
the meridian, in the opposite hemisphere, in the same degree
of latitude, will be found the antceei. The same place remaining under the meridian, set the index to XII, and turn the globe
until the other XII is under the index; then the periceci will
be on the meridian, under the same degree of latitude with the
given place, and the antipodes will be under the meridian, in
the same latitude, in the opposite hemisphere.
Ex. Find the anteeci, the periceci, and the antipodes of the
citizens of New York.
The antceci have the same hour of the day, but different
-~ The zenith will of course be the point of the meridian over the place.
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