Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 26.  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)
 04/28/2021   12:11:40   ( -71.15, 174.42) 04/28/2021   12:12:51  ( -71.16, 174.55)    4.87                71
 04/28/2021   13:02:23   (  71.02, -18.04) 04/28/2021   13:02:19  (  71.01, -18.05)    1.16                 4
 04/28/2021   13:53:03   ( -70.84, 149.57) 04/28/2021   13:51:49  ( -70.89, 149.40)    8.42                74
 05/01/2021   04:28:04   ( -71.39, -70.06) 05/01/2021   04:29:16  ( -71.29, -69.37)   26.70                72
 05/01/2021   05:18:43   (  71.04,  97.85) 05/01/2021   05:18:46  (  71.02,  97.85)    2.25                 3
 05/01/2021   06:09:24   ( -70.92, -94.63) 05/01/2021   06:08:16  ( -70.91, -94.69)    2.34                68
 05/03/2021   20:44:29   ( -71.67,  45.36) 05/03/2021   20:45:38  ( -71.58,  46.98)   57.78                69
 05/03/2021   21:35:02   (  71.02,-146.18) 05/03/2021   21:35:13  (  71.04,-146.25)    2.89                11
 05/03/2021   22:25:44   ( -70.95,  21.26) 05/03/2021   22:24:43  ( -70.93,  21.22)    3.14                61
 05/06/2021   13:00:54   ( -71.96, 160.75) 05/06/2021   13:02:00  ( -71.85, 163.32)   89.63                66
 05/06/2021   13:51:22   (  71.06, -30.30) 05/06/2021   13:51:40  (  71.04, -30.36)    2.74                18
 05/06/2021   14:42:03   ( -70.99, 137.14) 05/06/2021   14:41:08  ( -70.99, 137.19)    1.99                55
 05/09/2021   06:07:41   (  71.09,  85.58) 05/09/2021   06:08:05  (  71.10,  85.61)    1.12                24
 05/09/2021   06:58:22   ( -70.97,-106.90) 05/09/2021   06:57:35  ( -70.99,-106.92)    2.46                47