Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 1 4.  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)
 01/05/2021   21:22:33   ( -70.83,  36.57) 01/05/2021   21:23:40  ( -70.83,  36.60)    1.07                67
 01/05/2021   22:13:17   (  70.72,-155.94) 01/05/2021   22:13:07  (  70.73,-155.91)    1.54                10
 01/05/2021   23:03:53   ( -70.36,  11.97) 01/05/2021   23:02:41  ( -70.40,  11.23)   27.84                72
 01/08/2021   13:38:56   ( -70.93, 152.33) 01/08/2021   13:40:07  ( -70.88, 152.56)   10.25                71
 01/08/2021   14:29:38   (  70.72, -40.02) 01/08/2021   14:29:35  (  70.72, -40.03)    0.72                 3
 01/08/2021   15:20:18   ( -70.57, 127.56) 01/08/2021   15:19:05  ( -70.61, 127.43)    6.92                73
 01/11/2021   05:55:21   ( -71.14, -92.10) 01/11/2021   05:56:32  ( -71.04, -91.31)   30.73                71
 01/11/2021   06:45:59   (  70.72,  75.91) 01/11/2021   06:46:03  (  70.71,  75.83)    3.11                 4
 01/11/2021   07:36:41   ( -70.67,-116.69) 01/11/2021   07:35:32  ( -70.66,-116.62)    3.02                69
 01/13/2021   22:11:46   ( -71.35,  23.46) 01/13/2021   22:12:56  ( -71.24,  24.89)   52.65                70
 01/13/2021   23:02:20   (  70.73,-168.17) 01/13/2021   23:02:30  (  70.75,-168.23)    3.34                10
 01/13/2021   23:53:02   ( -70.68,  -0.76) 01/13/2021   23:52:00  ( -70.64,  -0.75)    3.54                62
 01/16/2021   14:28:11   ( -71.61, 138.91) 01/16/2021   14:29:18  ( -71.49, 141.18)   81.10                67
 01/16/2021   15:18:41   (  70.79, -52.34) 01/16/2021   15:18:56  (  70.78, -52.29)    1.71                15
 01/16/2021   16:09:22   ( -70.68, 115.16) 01/16/2021   16:08:26  ( -70.68, 115.18)    1.05                56