Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 5 10.  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)
 05/12/2020   06:19:28   ( -70.65, -98.19) 05/12/2020   06:20:32  ( -70.64, -98.21)    1.59                64
 05/12/2020   07:10:12   (  70.54,  69.30) 05/12/2020   07:09:59  (  70.53,  69.28)    1.26                13
 05/12/2020   08:00:46   ( -70.07,-122.65) 05/12/2020   07:59:35  ( -70.10,-123.72)   40.82                71
 05/14/2020   22:35:51   ( -70.66,  17.70) 05/14/2020   22:36:58  ( -70.68,  17.73)    2.31                67
 05/14/2020   23:26:35   (  70.55,-174.80) 05/14/2020   23:26:25  (  70.57,-174.79)    2.41                10
 05/15/2020   00:17:11   ( -70.19,  -6.91) 05/15/2020   00:15:59  ( -70.25,  -7.63)   27.79                72
 05/17/2020   14:52:15   ( -70.67, 133.60) 05/17/2020   14:53:26  ( -70.67, 133.59)    0.31                71
 05/17/2020   15:42:59   (  70.56, -58.91) 05/17/2020   15:42:53  (  70.55, -58.93)    0.94                 6
 05/17/2020   16:33:37   ( -70.30, 108.82) 05/17/2020   16:32:25  ( -70.34, 108.39)   16.82                72
 05/20/2020   07:08:41   ( -70.78,-110.68) 05/20/2020   07:09:52  ( -70.77,-110.38)   11.07                71
 05/20/2020   07:59:23   (  70.57,  56.98) 05/20/2020   07:59:20  (  70.60,  57.01)    3.31                 3
 05/20/2020   08:50:04   ( -70.46,-135.54) 05/20/2020   08:48:51  ( -70.44,-135.59)    3.16                73
 05/22/2020   23:25:07   ( -70.90,   5.04) 05/22/2020   23:26:19  ( -70.81,   5.57)   21.24                72
 05/23/2020   00:15:47   (  70.58, 172.87) 05/23/2020   00:15:48  (  70.59, 172.87)    0.89                 1
 05/23/2020   01:06:28   ( -70.47, -19.64) 05/23/2020   01:05:18  ( -70.49, -19.64)    1.83                70