L angular momentum
B magnetic field
E nadir vector
S Sun vector
A attitude vector
H horizon crossing vector; H; and Hc for in-crossing and out-crossing
<o angular velocity vector x w-dimensional state vector y rt-dimensional observation vector
P Sun angle = Sun/attitude angular separation
7j Nadir angle = Earth center/attitude angular separation
<J> Rotation angle from the Sun to the center of the Earth about the attiutde
>j/ Sun/Earth center angular separation
T Vernal Equinox Additional astronomical symbols are defined in Fig. 3-10.
A indicates an arbitrary interval, as At = i2 -1,
S indicates an infinitesimal interval in which first-order approximations may be used, as L= L„+ N5/ A dot over any symbol indicates differentiation with respect to time, i.e., x= dx/dt.
The Kronecker Delta, Sj, is defined as
The Dirac delta function, SD(x - x0), is defined by
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