VarEqT:

Path: Orbit/OrbitMechanics

% Computes the right hand side of the variational equations
   based on the equinoctial formulation with the acceleration
   in tangential coordinates. These equations are singular
   when i = pi/2 and/or h = 0.
   See also CT2REq and VarEqP.

   Since version 1.
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   Form:
   dEqDt = VarEqT( eq, aT, tol, mu )
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   ------
   Inputs
   ------
   eq                    Elements vector [a,P1,P2,Q1,Q2,l]
   aT                    Tangential disturbance vector [tangent;normal;z]
                           (default is zeros)
   tol                   Tolerance for the Kepler equation solver (0.0001)
   mu                    Gravitational parameter (3.98600436e5)

   -------
   Outputs
   -------
   dEqDt                 Derivative to the elements

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   References: Battin, R.H., An Introduction to the Methods and Mathematics
               of Astrodynamics, AIAA, New York, 1987, pp. 492-493.
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Children:

Orbit: OrbitCoord/CT2REq
Orbit: OrbitMechanics/VarEqP

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