Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and NOAA-20
TLE Epoch: 1999 12 31.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(NOAA-20) NOAA-20 Lat/Lon    Distance(km)  Time Diff(sec)
 12/31/1999   00:00:00   ( -90.00, 171.02) 11/24/-4713   12:00:00  ( -90.00, 171.02)    0.00                 0
 01/01/2000   03:46:39   ( -90.00, 113.21) 11/24/-4713   12:00:00  ( -90.00, 113.21)    0.00                 0
 01/02/2000   07:33:18   ( -90.00,  55.41) 11/24/-4713   12:00:00  ( -90.00,  55.41)    0.00                 0
 01/03/2000   11:19:58   ( -90.00,  -2.40) 11/24/-4713   12:00:00  ( -90.00,  -2.40)    0.00                 0
 01/04/2000   15:06:37   ( -90.00, -60.20) 11/24/-4713   12:00:00  ( -90.00, -60.20)    0.00                 0
 01/05/2000   18:53:17   ( -90.00,-118.01) 11/24/-4713   12:00:00  ( -90.00,-118.01)    0.00                 0
 01/06/2000   22:39:56   ( -90.00,-175.81) 11/24/-4713   12:00:00  ( -90.00,-175.81)    0.00                 0
 01/08/2000   02:26:36   ( -90.00, 126.38) 11/24/-4713   12:00:00  ( -90.00, 126.38)    0.00                 0
 01/09/2000   06:13:15   ( -90.00,  68.58) 11/24/-4713   12:00:00  ( -90.00,  68.58)    0.00                 0
 01/10/2000   09:59:55   ( -90.00,  10.77) 11/24/-4713   12:00:00  ( -90.00,  10.77)    0.00                 0
 01/11/2000   13:46:34   ( -90.00, -47.03) 11/24/-4713   12:00:00  ( -90.00, -47.03)    0.00                 0
 01/12/2000   17:33:14   ( -90.00,-104.84) 11/24/-4713   12:00:00  ( -90.00,-104.84)    0.00                 0