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AST 3722C  Spring 2008
Homework #2. Due before class on January 29.
Instructions: Solve each part of the problem below. Where math is involved, and unless
otherwise indicated, show your work.
You know that things rise in the “East” and set in the “West.” You should also know that
this really means that various things rise everywhere along the eastern half of the horizon
and set everywhere along the western half. I.e. not everything rises due
East and sets due
West. Because of this, not everything spends 12 hours above the horizon. The amount of
time above the horizon depends on an object’s
δ
. In this problem you will investigate this.
(a)
[0.5 points]
Suppose we’re in Orlando so
φ
=
φ
0
= 28
.
6
◦
. Find the upper and lower
bounds on
δ
such that
a
can be zero. I.e. what is the range of declinations of objects that
are neither circumpolar nor permanently below the horizon? (You should be able to answer
this with simple arithmetic, but explain your answer.)
(b)
[0.5 points]
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 Spring '09
 Fernandez
 Astronomy

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