Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 5 20.  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)
 05/20/2020   07:08:46   ( -71.09,-111.20) 05/20/2020   07:09:56  ( -70.98,-109.89)   48.91                70
 05/20/2020   07:59:21   (  70.50,  57.08) 05/20/2020   07:59:30  (  70.50,  57.01)    2.85                 9
 05/20/2020   08:50:02   ( -70.41,-135.45) 05/20/2020   08:48:59  ( -70.44,-135.43)    3.39                63
 05/22/2020   23:25:14   ( -71.32,   4.32) 05/22/2020   23:26:22  ( -71.18,   6.30)   72.45                68
 05/23/2020   00:15:45   (  70.52, 172.96) 05/23/2020   00:15:59  (  70.53, 172.94)    1.18                14
 05/23/2020   01:06:26   ( -70.43, -19.56) 05/23/2020   01:05:29  ( -70.42, -19.58)    0.64                57
 05/25/2020   15:41:41   ( -71.49, 119.93) 05/25/2020   15:42:47  ( -71.43, 122.59)   94.37                66
 05/25/2020   16:32:09   (  70.54, -71.16) 05/25/2020   16:32:28  (  70.56, -71.13)    2.41                19
 05/25/2020   17:22:50   ( -70.44,  96.32) 05/25/2020   17:21:58  ( -70.46,  96.35)    1.99                52
 05/28/2020   08:48:33   (  70.56,  44.72) 05/28/2020   08:48:58  (  70.53,  44.72)    3.32                25
 05/28/2020   09:39:14   ( -70.46,-147.80) 05/28/2020   09:38:28  ( -70.43,-147.80)    3.18                46
 05/31/2020   01:04:55   (  70.53, 160.67) 05/31/2020   01:05:26  (  70.56, 160.64)    3.00                31
 05/31/2020   01:55:37   ( -70.48, -31.92) 05/31/2020   01:54:56  ( -70.46, -31.88)    2.81                41
 06/02/2020   17:21:19   (  70.56, -83.46) 06/02/2020   17:21:55  (  70.58, -83.45)    2.42                36
 06/02/2020   18:12:01   ( -70.50,  83.96) 06/02/2020   18:11:25  ( -70.48,  84.04)    3.66                36