Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 5 9.  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)
 05/09/2020   14:03:04   ( -70.65, 145.91) 05/09/2020   14:04:04  ( -70.64, 145.91)    0.73                60
 05/09/2020   14:53:48   (  70.53, -46.59) 05/09/2020   14:53:31  (  70.53, -46.60)    0.61                17
 05/09/2020   15:44:19   ( -69.91, 121.70) 05/09/2020   15:43:09  ( -69.99, 120.24)   56.12                70
 05/12/2020   06:19:28   ( -70.66, -98.20) 05/12/2020   06:20:31  ( -70.66, -98.18)    0.95                63
 05/12/2020   07:10:12   (  70.54,  69.30) 05/12/2020   07:09:58  (  70.55,  69.30)    1.34                14
 05/12/2020   08:00:45   ( -70.02,-122.57) 05/12/2020   07:59:34  ( -70.12,-123.69)   43.96                71
 05/14/2020   22:35:52   ( -70.67,  17.70) 05/14/2020   22:36:58  ( -70.68,  17.73)    2.00                66
 05/14/2020   23:26:36   (  70.55,-174.81) 05/14/2020   23:26:25  (  70.57,-174.80)    1.85                11
 05/15/2020   00:17:10   ( -70.14,  -6.84) 05/15/2020   00:15:59  ( -70.19,  -7.71)   33.56                71
 05/17/2020   14:52:15   ( -70.67, 133.59) 05/17/2020   14:53:24  ( -70.69, 133.63)    2.67                69
 05/17/2020   15:42:59   (  70.56, -58.92) 05/17/2020   15:42:51  (  70.58, -58.90)    2.01                 8
 05/17/2020   16:33:36   ( -70.25, 108.89) 05/17/2020   16:32:24  ( -70.31, 108.35)   21.66                72
 05/20/2020   07:08:40   ( -70.74,-110.61) 05/20/2020   07:09:51  ( -70.71,-110.47)    5.96                71
 05/20/2020   07:59:23   (  70.58,  56.97) 05/20/2020   07:59:18  (  70.59,  57.00)    1.84                 5
 05/20/2020   08:50:02   ( -70.37,-135.38) 05/20/2020   08:48:49  ( -70.44,-135.60)   11.11                73
 05/22/2020   23:25:05   ( -70.80,   5.20) 05/22/2020   23:26:17  ( -70.77,   5.50)   11.63                72
 05/23/2020   00:15:47   (  70.59, 172.85) 05/23/2020   00:15:45  (  70.60, 172.89)    1.49                 2
 05/23/2020   01:06:28   ( -70.48, -19.66) 05/23/2020   01:05:15  ( -70.50, -19.63)    2.09                73