94 
THE GUIDE TO NATURE 
light of the sun, casts a great conical 
shadow. When this shadow strikes the 
earth those within the shadow have a 
total eclipse and those near the shadow 
who receive some but not all of the 
Figure 2. Regions in which the eclipse 
is visible. 
light of the sun have a partial eclipse. 
If any part of the earth is in the shadow 
the eclipse is called total. In this case 
the moon is so much north of the sun 
when they pass that the shadow cone 
does not touch the earth at all, so that 
Orono, Maine, 0.44 of the diameter is 
hidden, which is about the largest 
amount for any place in the United 
States. Figure 2 shows the parts of 
the earth which will see the eclipse. 
Within those parts enclosed in the 
loops the sun is near rising (left loop) 
or near setting (right loop) while the 
eclipse is in progress, hence the whole 
eclipse is not seen from these places. 
The time at which an eclipse of the 
sun begins or ends and the magnitude 
and appearance of the eclipse are dif- 
ferent at each place so that it is not 
possible to give a picture of conditions 
which will suit all places, as can be 
done in an eclipse of the moon. Figure 
3 shows the parts of the United States 
from which the eclipse can be seen. It 
will be seen that some of the States in 
the West and South will not see the 
eclipse at all. On this map lines are 
drawn marked 10, 20, 30 and 40. These 
represent the places where this per- 
centage of the sun’s diameter is covered 
Figure 3. Showing the Central Standard times of maximum eclipse and 
magnitude of the eclipse as seen in the United States. 
no one has a total eclipse, but the 
shadow comes close enough to bring a 
part of the earth in the region from 
which a part of the sun’s light is cut off. 
These people see a partial eclipse of the 
sun. The point of the earth which 
comes nearest to the center of the 
shadow and thus has the largest par- 
tial eclipse is a point on the Atlantic 
ocean. There about three-quarters of 
the sun’s diameter will be concealed. At 
by the moon. Other lines marked 8.30, 
8.40, etc., show the places where the 
middle of the eclipse occurs at the given 
Central Standard time. If the place 
uses Eastern Standard time an hour 
should be added ; if Mountain Standard 
time an hour should be subtracted. The 
time and magnitude of the eclipse at 
places not on the lines can be estimated 
from the distance of the places from 
the two lines between which they lie. 
