def isPostCSP(t, switch=961986575.):
    """
    Given a GALEX time stamp, return TRUE if it corresponds to a "post-CSP"
        eclipse. The actual CSP was on eclipse 37423, but the clock change
        (which matters more for calibration purposes) occured on 38268
        (t~=961986575.)

    :param t: The time stamp to test.

    :type t: float

    :param switch: The GALEX time stamp that defines pre- and post-CSP.

    :type switch: float

    :returns: bool -- Does this time correspond to a post-CSP eclipse?
    """

    # Check that the tscale has been applied properly
    if not switch/100. < t < switch*100.:
        raise ValueError('Did you apply tscale wrong?')

    return t >= switch