Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 4 18.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 04/18/2020   03:51:53   ( -70.54, -61.18) 04/18/2020   03:52:27  ( -70.54, -61.25)    2.89                34
 04/18/2020   04:42:37   (  70.45, 106.28) 04/18/2020   04:41:54  (  70.44, 106.23)    2.02                43
 04/20/2020   20:08:18   ( -70.59,  54.65) 04/20/2020   20:08:54  ( -70.59,  54.70)    1.94                36
 04/20/2020   20:59:02   (  70.50,-137.89) 04/20/2020   20:58:21  (  70.48,-137.82)    2.97                41
 04/23/2020   12:24:42   ( -70.59, 170.55) 04/23/2020   12:25:22  ( -70.59, 170.56)    0.57                40
 04/23/2020   13:15:26   (  70.50, -21.98) 04/23/2020   13:14:49  (  70.47, -21.96)    2.77                37
 04/26/2020   04:41:05   ( -70.59, -73.54) 04/26/2020   04:41:49  ( -70.57, -73.58)    2.37                44
 04/26/2020   05:31:49   (  70.50,  93.92) 04/26/2020   05:31:15  (  70.51,  93.98)    2.60                34
 04/28/2020   20:57:29   ( -70.60,  42.36) 04/28/2020   20:58:16  ( -70.61,  42.36)    1.93                47
 04/28/2020   21:48:13   (  70.50,-150.18) 04/28/2020   21:47:43  (  70.49,-150.17)    0.78                30
 05/01/2020   13:13:53   ( -70.60, 158.26) 05/01/2020   13:14:44  ( -70.59, 158.21)    2.07                51
 05/01/2020   14:04:37   (  70.50, -34.28) 05/01/2020   14:04:10  (  70.53, -34.25)    2.61                27