Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 9 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)
 09/22/2019   03:08:40   ( -70.87, -51.01) 09/22/2019   03:09:51  ( -70.78, -49.97)   39.41                71
 09/22/2019   03:59:17   (  70.39, 117.08) 09/22/2019   03:59:23  (  70.40, 117.11)    1.84                 6
 09/22/2019   04:49:58   ( -70.29, -75.44) 09/22/2019   04:48:53  ( -70.30, -75.41)    1.19                65
 09/24/2019   19:25:09   ( -71.01,  64.65) 09/24/2019   19:26:19  ( -70.89,  66.07)   53.32                70
 09/24/2019   20:15:43   (  70.37,-127.00) 09/24/2019   20:15:53  (  70.40,-127.02)    2.72                10
 09/24/2019   21:06:24   ( -70.27,  40.48) 09/24/2019   21:05:23  ( -70.29,  40.46)    2.55                61
 09/27/2019   11:41:37   ( -71.15,-179.69) 09/27/2019   11:42:45  ( -71.04,-177.81)   68.83                68
 09/27/2019   12:32:09   (  70.41, -11.17) 09/27/2019   12:32:22  (  70.39, -11.16)    2.73                13
 09/27/2019   13:22:50   ( -70.30, 156.32) 09/27/2019   13:21:52  ( -70.28, 156.33)    2.09                58
 09/30/2019   03:58:06   ( -71.28, -64.04) 09/30/2019   03:59:13  ( -71.14, -61.78)   82.63                67
 09/30/2019   04:48:35   (  70.40, 104.74) 09/30/2019   04:48:52  (  70.37, 104.70)    2.90                17
 09/30/2019   05:39:16   ( -70.28, -87.77) 09/30/2019   05:38:22  ( -70.27, -87.81)    2.17                54
 10/02/2019   20:14:34   ( -71.37,  51.70) 10/02/2019   20:15:40  ( -71.28,  54.34)   94.43                66
 10/02/2019   21:05:01   (  70.39,-139.36) 10/02/2019   21:05:21  (  70.41,-139.36)    2.96                20
 10/02/2019   21:55:43   ( -70.32,  28.07) 10/02/2019   21:54:51  ( -70.31,  28.12)    2.22                52