@Test
public void testGetCenterTimeValue() throws Exception {

    final double centerTimeMJD = (endTimeMJD - startTimeMJD) / 2 + startTimeMJD;
    assertEquals(5.5, di.getValue(centerTimeMJD, 45, -90));
    assertEquals(7.6, di.getValue(centerTimeMJD, 45, 90));
    assertEquals(3.85, di.getValue(centerTimeMJD, -45, -90));
    assertEquals(9.125, di.getValue(centerTimeMJD, -45, 90));
}