Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 5 13.  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)
 05/14/2020   22:35:52   ( -70.71,  17.62) 05/14/2020   22:37:04  ( -70.67,  17.75)    6.60                72
 05/14/2020   23:26:35   (  70.54,-174.79) 05/14/2020   23:26:31  (  70.55,-174.77)    1.67                 4
 05/15/2020   00:17:15   ( -70.39,  -7.23) 05/15/2020   00:16:02  ( -70.40,  -7.36)    4.94                73
 05/17/2020   14:52:21   ( -70.98, 133.08) 05/17/2020   14:53:32  ( -70.85, 133.91)   33.18                71
 05/17/2020   15:42:59   (  70.55, -58.91) 05/17/2020   15:43:02  (  70.58, -58.87)    2.79                 3
 05/17/2020   16:33:40   ( -70.46, 108.57) 05/17/2020   16:32:33  ( -70.43, 108.54)    3.33                67
 05/20/2020   07:08:50   ( -71.25,-111.48) 05/20/2020   07:09:59  ( -71.15,-109.77)   62.25                69
 05/20/2020   07:59:23   (  70.57,  56.98) 05/20/2020   07:59:34  (  70.60,  57.02)    3.38                11
 05/20/2020   08:50:04   ( -70.47,-135.54) 05/20/2020   08:49:05  ( -70.45,-135.56)    2.30                59
 05/22/2020   23:25:19   ( -71.58,   3.85) 05/22/2020   23:26:25  ( -71.49,   6.64)   98.53                66
 05/23/2020   00:15:46   (  70.59, 172.86) 05/23/2020   00:16:07  (  70.56, 172.83)    3.36                21
 05/23/2020   01:06:27   ( -70.48, -19.66) 05/23/2020   01:05:37  ( -70.47, -19.68)    1.82                50
 05/25/2020   16:32:10   (  70.61, -71.27) 05/25/2020   16:32:40  (  70.63, -71.22)    3.07                30
 05/25/2020   17:22:51   ( -70.50,  96.23) 05/25/2020   17:22:11  ( -70.48,  96.20)    1.93                40