Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 9 17.  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)
 09/19/2019   10:52:12   ( -70.79,-166.76) 09/19/2019   10:53:23  ( -70.68,-166.00)   30.46                71
 09/19/2019   11:42:51   (  70.41,   1.16) 09/19/2019   11:42:53  (  70.41,   1.24)    3.00                 2
 09/19/2019   12:33:31   ( -70.26, 168.72) 09/19/2019   12:32:24  ( -70.25, 168.64)    3.10                67
 09/22/2019   03:08:41   ( -70.93, -51.10) 09/22/2019   03:09:51  ( -70.79, -49.95)   44.42                70
 09/22/2019   03:59:17   (  70.39, 117.08) 09/22/2019   03:59:23  (  70.41, 117.12)    2.61                 6
 09/22/2019   04:49:58   ( -70.29, -75.44) 09/22/2019   04:48:53  ( -70.31, -75.39)    2.51                65
 09/24/2019   19:25:09   ( -71.01,  64.65) 09/24/2019   19:26:19  ( -70.90,  66.10)   54.02                70
 09/24/2019   20:15:43   (  70.38,-127.01) 09/24/2019   20:15:53  (  70.41,-127.00)    3.39                10
 09/24/2019   21:06:24   ( -70.27,  40.48) 09/24/2019   21:05:24  ( -70.25,  40.41)    3.41                60
 09/27/2019   11:41:37   ( -71.15,-179.70) 09/27/2019   11:42:45  ( -71.06,-177.77)   70.12                68
 09/27/2019   12:32:09   (  70.42, -11.19) 09/27/2019   12:32:22  (  70.41, -11.13)    2.76                13
 09/27/2019   13:22:50   ( -70.31, 156.31) 09/27/2019   13:21:52  ( -70.31, 156.36)    1.96                58
 09/30/2019   03:58:06   ( -71.29, -64.05) 09/30/2019   03:59:13  ( -71.17, -61.73)   84.37                67
 09/30/2019   04:48:35   (  70.41, 104.72) 09/30/2019   04:48:52  (  70.40, 104.74)    1.46                17
 09/30/2019   05:39:16   ( -70.29, -87.78) 09/30/2019   05:38:22  ( -70.30, -87.77)    0.94                54