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Astronomical Applications Department, U.S. Naval Observatory - Precession Memo (Page 10)

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Astronomical Applications Department, U.S. Naval Observatory - Precession Memo
5.1 Precession Nulling
We may adjust the cone angle
to control the precession rate. Let us find the angle such that the pre-
cession is nulled (i.e., the torques cancel out). From eq. (48), we see that this requires
(50)
G
(
a, b, h,
a , A
C
, A
T
) =
0
Referring to eq. (44), we find that this is equivalent to requiring
(51)
(b
-
a)[(1
-
A
C
+
2 A
C
cos
2
a)(h sin a
+
a cos
a)(a
+
b)
-
1
3
(3
+
A
C
)(a
2
+
a b
+
b
2
) cos
a
+
(1
-
A
T
) a
2
h sin
a
=
0
The only physically meaningful solution of eq. (51) for
will be near .
o
2
[Plug and chug...]
6 Numerical Results for the Combined
Effects of Solar Wind and Solar Radia-
tion Pressures
[Blah blah blah...]
page 10 of 10

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