Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 5 21.  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)
 05/22/2020   23:25:14   ( -71.32,   4.32) 05/22/2020   23:26:22  ( -71.18,   6.30)   72.46                68
 05/23/2020   00:15:45   (  70.52, 172.97) 05/23/2020   00:15:59  (  70.53, 172.95)    1.48                14
 05/23/2020   01:06:26   ( -70.43, -19.56) 05/23/2020   01:05:29  ( -70.42, -19.58)    0.68                57
 05/25/2020   15:41:41   ( -71.49, 119.93) 05/25/2020   15:42:47  ( -71.43, 122.59)   94.43                66
 05/25/2020   16:32:09   (  70.54, -71.16) 05/25/2020   16:32:28  (  70.56, -71.12)    2.77                19
 05/25/2020   17:22:50   ( -70.44,  96.32) 05/25/2020   17:21:58  ( -70.46,  96.35)    1.97                52
 05/28/2020   08:48:33   (  70.56,  44.72) 05/28/2020   08:48:58  (  70.54,  44.72)    3.01                25
 05/28/2020   09:39:14   ( -70.46,-147.80) 05/28/2020   09:38:28  ( -70.43,-147.80)    3.26                46
 05/31/2020   01:04:55   (  70.53, 160.67) 05/31/2020   01:05:26  (  70.56, 160.64)    3.16                31
 05/31/2020   01:55:37   ( -70.48, -31.92) 05/31/2020   01:54:56  ( -70.46, -31.87)    3.00                41
 06/02/2020   17:21:19   (  70.56, -83.46) 06/02/2020   17:21:55  (  70.58, -83.44)    2.68                36
 06/02/2020   18:12:00   ( -70.45,  84.04) 06/02/2020   18:11:26  ( -70.43,  83.96)    3.58                34