Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 2 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)
 02/20/2021   11:41:52   ( -70.89,-178.11) 02/20/2021   11:42:30  ( -70.91,-178.06)    2.84                38
 02/20/2021   12:32:36   (  70.80, -10.65) 02/20/2021   12:31:57  (  70.81, -10.57)    3.54                39
 02/23/2021   03:58:13   ( -70.91, -62.21) 02/23/2021   03:58:58  ( -70.92, -62.17)    1.80                45
 02/23/2021   04:48:57   (  70.82, 105.24) 02/23/2021   04:48:25  (  70.82, 105.32)    2.82                32
 02/25/2021   20:14:34   ( -70.93,  53.69) 02/25/2021   20:15:26  ( -70.92,  53.71)    1.03                52
 02/25/2021   21:05:17   (  70.79,-138.78) 02/25/2021   21:04:53  (  70.82,-138.80)    2.81                24
 02/25/2021   21:55:43   ( -69.88,  29.99) 02/25/2021   21:54:37  ( -69.94,  27.55)   93.34                66
 02/28/2021   12:30:55   ( -70.94, 169.59) 02/28/2021   12:31:54  ( -70.92, 169.59)    2.63                59
 02/28/2021   13:21:38   (  70.82, -22.89) 02/28/2021   13:21:21  (  70.81, -22.93)    1.30                17
 02/28/2021   14:12:09   ( -70.16, 145.48) 02/28/2021   14:11:00  ( -70.21, 143.82)   63.13                69
 03/03/2021   04:47:15   ( -70.96, -74.51) 03/03/2021   04:48:20  ( -70.97, -74.45)    2.50                65
 03/03/2021   05:37:58   (  70.84,  93.00) 03/03/2021   05:37:47  (  70.86,  93.03)    2.23                11
 03/03/2021   06:28:34   ( -70.44, -99.03) 03/03/2021   06:27:22  ( -70.48, -99.91)   33.11                72