Return a tuple of information about the earth's axis and position.

    `t` - A Time object.

    The returned tuple contains five items:

    ``mean_ob`` - Mean obliquity of the ecliptic in degrees.
    ``true_ob`` - True obliquity of the ecliptic in degrees.
    ``eq_eq`` - Equation of the equinoxes in seconds of time.
    ``d_psi`` - Nutation in longitude in arcseconds.
    ``d_eps`` - Nutation in obliquity in arcseconds.

def earth_tilt(t):
    """Return a tuple of information about the earth's axis and position.

    `t` - A Time object.

    The returned tuple contains five items:

    ``mean_ob`` - Mean obliquity of the ecliptic in degrees.
    ``true_ob`` - True obliquity of the ecliptic in degrees.
    ``eq_eq`` - Equation of the equinoxes in seconds of time.
    ``d_psi`` - Nutation in longitude in arcseconds.
    ``d_eps`` - Nutation in obliquity in arcseconds.

    """
    dp, de = t._nutation_angles
    c_terms = equation_of_the_equinoxes_complimentary_terms(t.tt) / ASEC2RAD

    d_psi = dp * 1e-7 + t.psi_correction
    d_eps = de * 1e-7 + t.eps_correction

    mean_ob = mean_obliquity(t.tdb)
    true_ob = mean_ob + d_eps

    mean_ob /= 3600.0
    true_ob /= 3600.0

    eq_eq = d_psi * cos(mean_ob * DEG2RAD) + c_terms
    eq_eq /= 15.0

    return mean_ob, true_ob, eq_eq, d_psi, d_eps