Astronomical Applications Department, U.S. Naval Observatory Precession Maple Page 6
(
)
- +
I
y
I
x
( )
cos
( )
sin
t
2
I
z
K
z
I
z
+
-
:=
tmp
%
Clean up the third equation a bit
(
)
algsubs
,
=
( )
cos
( )
sin
A tmp
3
algsubs
,
=
(
)
sin
t
B
t
%
(
)
algsubs
,
=
-
I
x
I
y
C I
z
%
-
-
(
)
- +
I
y
I
x
t
( )
sin
2
I
z
(
)
- +
I
y
I
x
t
( )
cos
2
I
z
t
t
(
)
sin
(
)
- +
I
y
I
x
A
-
t
2
t
2
(
)
sin
2
I
z
2
t
2
2
t
2
(
)
cos
K
z
I
z
+
+
+
-
A
-
t
2
t
2
(
)
sin
2
C
B (
)
-
+
( )
cos
2
C I
z
( )
sin
2
C I
z
I
z
I
z
2
t
2
-
+
2
t
2
(
)
cos
K
z
I
z
+
-
Collect
,
,
,
%
,
, , ,
,
,
2
t t
2
t t
A B C
t
2
( )
cos
simplify alg
subs
,
,
,
=
A
( )
cos
( )
sin
=
B
(
)
sin
t
t
=
C
-
I
x
I
y
I
z
%
2
t
2
2
t
2
(
)
cos
+
(
)
- +
1
(
)
cos
2
t
2
t
2
(
)
- +
I
y
I
x
( )
cos
( )
sin
I
z
+
+
-
(
)
-
+
2
( )
cos
2
1 (
)
- +
I
y
I
x
I
z
1
t
(
)
sin
t
K
z
I
z
+
-
Page 6
