Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 1 15.  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)
 01/15/2020   08:36:14   ( -70.52,-132.37) 01/15/2020   08:37:21  ( -70.51,-132.30)    2.91                67
 01/15/2020   09:26:58   (  70.40,  35.14) 01/15/2020   09:26:48  (  70.40,  35.19)    2.23                10
 01/15/2020   10:17:34   ( -70.04,-156.99) 01/15/2020   10:16:22  ( -70.07,-157.65)   25.25                72
 01/18/2020   00:52:39   ( -70.51, -16.46) 01/18/2020   00:53:50  ( -70.48, -16.46)    3.74                71
 01/18/2020   01:43:23   (  70.39, 151.04) 01/18/2020   01:43:17  (  70.37, 151.03)    2.29                 6
 01/18/2020   02:34:01   ( -70.14, -41.24) 01/18/2020   02:32:48  ( -70.21, -41.57)   14.67                73
 01/20/2020   17:09:05   ( -70.61,  99.28) 01/20/2020   17:10:16  ( -70.56,  99.54)   11.18                71
 01/20/2020   17:59:47   (  70.39, -93.06) 01/20/2020   17:59:44  (  70.39, -93.06)    0.42                 3
 01/20/2020   18:50:27   ( -70.24,  74.50) 01/20/2020   18:49:15  ( -70.23,  74.34)    6.12                72
 01/23/2020   09:25:32   ( -70.71,-144.98) 01/23/2020   09:26:43  ( -70.63,-144.47)   20.60                71
 01/23/2020   10:16:12   (  70.39,  22.85) 01/23/2020   10:16:12  (  70.41,  22.84)    2.52                 0
 01/23/2020   11:06:53   ( -70.29,-169.67) 01/23/2020   11:05:42  ( -70.31,-169.67)    2.49                71
 01/26/2020   01:41:59   ( -70.81, -29.24) 01/26/2020   01:43:10  ( -70.70, -28.49)   30.12                71
 01/26/2020   02:32:38   (  70.44, 138.67) 01/26/2020   02:32:40  (  70.42, 138.74)    3.36                 2
 01/26/2020   03:23:19   ( -70.33, -53.85) 01/26/2020   03:22:10  ( -70.32, -53.77)    2.97                69
 01/28/2020   17:58:26   ( -70.91,  86.49) 01/28/2020   17:59:37  ( -70.77,  87.49)   39.63                71
 01/28/2020   18:49:03   (  70.44,-105.43) 01/28/2020   18:49:08  (  70.43,-105.36)    2.68                 5
 01/28/2020   19:39:44   ( -70.33,  62.06) 01/28/2020   19:38:38  ( -70.33,  62.13)    2.55                66