Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 22.  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)
 08/24/2021   13:13:56   ( -71.82, 158.55) 08/24/2021   13:15:05  ( -71.74, 160.18)   57.21                69
 08/24/2021   14:04:30   (  71.23, -33.08) 08/24/2021   14:04:40  (  71.21, -33.05)    2.22                10
 08/24/2021   14:55:11   ( -71.10, 134.47) 08/24/2021   14:54:10  ( -71.10, 134.41)    2.38                61
 08/27/2021   06:20:48   (  71.22,  82.89) 08/27/2021   06:21:09  (  71.24,  82.88)    2.80                21
 08/27/2021   07:11:30   ( -71.14,-109.66) 08/27/2021   07:10:39  ( -71.13,-109.66)    0.46                51
 08/29/2021   22:37:07   (  71.26,-161.24) 08/29/2021   22:37:38  (  71.27,-161.19)    2.24                31
 08/29/2021   23:27:49   ( -71.18,   6.21) 08/29/2021   23:27:08  ( -71.17,   6.27)    2.82                41
 09/01/2021   14:53:25   (  71.25, -45.29) 09/01/2021   14:54:08  (  71.24, -45.36)    2.98                43
 09/01/2021   15:44:07   ( -71.17, 122.17) 09/01/2021   15:43:37  ( -71.19, 122.19)    1.97                30
 09/04/2021   07:09:43   (  71.30,  70.58) 09/04/2021   07:10:35  (  71.31,  70.64)    2.74                52
 09/04/2021   08:00:25   ( -71.22,-121.96) 09/04/2021   08:00:05  ( -71.21,-121.89)    2.86                20