Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 1.  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)
 03/03/2021   04:47:14   ( -70.93, -74.46) 03/03/2021   04:48:21  ( -70.92, -74.53)    3.02                67
 03/03/2021   05:37:58   (  70.85,  92.99) 03/03/2021   05:37:48  (  70.82,  92.97)    3.08                10
 03/03/2021   06:28:33   ( -70.41, -98.97) 03/03/2021   06:27:22  ( -70.49, -99.91)   35.92                71
 03/05/2021   21:03:35   ( -71.01,  41.34) 03/05/2021   21:04:46  ( -71.01,  41.49)    5.60                71
 03/05/2021   21:54:17   (  70.84,-151.05) 03/05/2021   21:54:14  (  70.86,-151.10)    3.14                 3
 03/05/2021   22:44:58   ( -70.70,  16.49) 03/05/2021   22:43:44  ( -70.74,  16.36)    6.81                74
 03/08/2021   13:20:00   ( -71.25, 156.86) 03/08/2021   13:21:11  ( -71.15, 157.60)   28.54                71
 03/08/2021   14:10:38   (  70.87, -35.19) 03/08/2021   14:10:41  (  70.89, -35.17)    1.70                 3
 03/08/2021   15:01:20   ( -70.78, 132.28) 03/08/2021   15:00:11  ( -70.78, 132.29)    0.90                69
 03/11/2021   05:36:25   ( -71.49, -87.63) 03/11/2021   05:37:34  ( -71.40, -86.13)   54.21                69
 03/11/2021   06:26:59   (  70.91,  80.68) 03/11/2021   06:27:08  (  70.91,  80.74)    2.31                 9
 03/11/2021   07:17:41   ( -70.82,-111.84) 03/11/2021   07:16:38  ( -70.80,-111.79)    2.45                63
 03/13/2021   21:52:50   ( -71.73,  27.86) 03/13/2021   21:53:57  ( -71.63,  30.14)   80.52                67
 03/13/2021   22:43:19   (  70.90,-163.37) 03/13/2021   22:43:35  (  70.93,-163.35)    3.27                16
 03/13/2021   23:34:01   ( -70.80,   4.12) 03/13/2021   23:33:05  ( -70.82,   4.12)    2.65                56