Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 5 1.  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)
 05/01/2020   13:13:53   ( -70.62, 158.23) 05/01/2020   13:14:43  ( -70.62, 158.25)    0.81                50
 05/01/2020   14:04:37   (  70.51, -34.29) 05/01/2020   14:04:10  (  70.51, -34.26)    0.93                27
 05/01/2020   14:55:01   ( -69.51, 134.56) 05/01/2020   14:53:55  ( -69.58, 132.05)   97.71                66
 05/04/2020   05:30:17   ( -70.63, -85.88) 05/04/2020   05:31:10  ( -70.65, -85.83)    3.15                53
 05/04/2020   06:21:01   (  70.52,  81.61) 05/04/2020   06:20:37  (  70.54,  81.65)    2.93                24
 05/04/2020   07:11:28   ( -69.68,-109.78) 05/04/2020   07:10:20  ( -69.72,-111.88)   81.23                68
 05/06/2020   21:46:40   ( -70.64,  30.01) 05/06/2020   21:47:37  ( -70.62,  30.01)    1.86                57
 05/06/2020   22:37:24   (  70.53,-162.50) 05/06/2020   22:37:04  (  70.51,-162.52)    2.50                20
 05/06/2020   23:27:53   ( -69.79,   5.96) 05/06/2020   23:26:44  ( -69.86,   4.18)   68.35                69
 05/09/2020   14:03:04   ( -70.65, 145.90) 05/09/2020   14:04:04  ( -70.64, 145.92)    1.10                60
 05/09/2020   14:53:48   (  70.54, -46.62) 05/09/2020   14:53:31  (  70.53, -46.61)    1.91                17
 05/09/2020   15:44:19   ( -69.91, 121.69) 05/09/2020   15:43:09  ( -69.99, 120.25)   55.62                70
 05/12/2020   06:19:28   ( -70.67, -98.22) 05/12/2020   06:20:31  ( -70.66, -98.18)    1.52                63
 05/12/2020   07:10:12   (  70.56,  69.27) 05/12/2020   07:09:58  (  70.54,  69.29)    2.26                14
 05/12/2020   08:00:45   ( -70.03,-122.59) 05/12/2020   07:59:34  ( -70.12,-123.70)   43.03                71
 05/14/2020   22:35:52   ( -70.68,  17.67) 05/14/2020   22:36:58  ( -70.67,  17.72)    2.37                66
 05/14/2020   23:26:35   (  70.53,-174.77) 05/14/2020   23:26:25  (  70.55,-174.81)    3.29                10
 05/15/2020   00:17:11   ( -70.16,  -6.87) 05/15/2020   00:15:59  ( -70.24,  -7.64)   30.59                72