Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 3.  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   ( -70.92, -74.45) 03/03/2021   04:48:21  ( -70.93, -74.53)    2.86                67
 03/03/2021   05:37:58   (  70.85,  93.00) 03/03/2021   05:37:48  (  70.83,  92.98)    1.70                10
 03/03/2021   06:28:34   ( -70.46, -99.05) 03/03/2021   06:27:22  ( -70.49, -99.90)   32.04                72
 03/05/2021   21:03:35   ( -71.01,  41.35) 03/05/2021   21:04:47  ( -70.96,  41.42)    5.26                72
 03/05/2021   21:54:18   (  70.88,-151.13) 03/05/2021   21:54:14  (  70.87,-151.09)    2.23                 4
 03/05/2021   22:44:58   ( -70.69,  16.50) 03/05/2021   22:43:44  ( -70.75,  16.36)    7.82                74
 03/08/2021   13:20:00   ( -71.24, 156.87) 03/08/2021   13:21:12  ( -71.11, 157.52)   27.96                72
 03/08/2021   14:10:38   (  70.87, -35.17) 03/08/2021   14:10:41  (  70.90, -35.16)    3.44                 3
 03/08/2021   15:01:20   ( -70.78, 132.29) 03/08/2021   15:00:11  ( -70.78, 132.30)    0.69                69
 03/11/2021   05:36:25   ( -71.48, -87.62) 03/11/2021   05:37:34  ( -71.41, -86.12)   54.04                69
 03/11/2021   06:26:59   (  70.91,  80.69) 03/11/2021   06:27:08  (  70.92,  80.76)    3.16                 9
 03/11/2021   07:17:41   ( -70.81,-111.83) 03/11/2021   07:16:38  ( -70.81,-111.78)    2.04                63
 03/13/2021   21:52:50   ( -71.72,  27.87) 03/13/2021   21:53:57  ( -71.65,  30.16)   80.56                67
 03/13/2021   22:43:19   (  70.89,-163.36) 03/13/2021   22:43:36  (  70.89,-163.41)    1.97                17
 03/13/2021   23:34:01   ( -70.79,   4.13) 03/13/2021   23:33:06  ( -70.78,   4.06)    2.80                55
 03/16/2021   14:59:39   (  70.94, -47.49) 03/16/2021   15:00:02  (  70.91, -47.50)    3.37                23
 03/16/2021   15:50:21   ( -70.83, 120.00) 03/16/2021   15:49:32  ( -70.80, 119.97)    3.31                49