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