Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 9 18.  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   ( -70.77,-166.72) 09/19/2019   10:53:24  ( -70.65,-166.05)   28.03                72
 09/19/2019   11:42:51   (  70.39,   1.20) 09/19/2019   11:42:54  (  70.38,   1.20)    0.82                 3
 09/19/2019   12:33:32   ( -70.29, 168.68) 09/19/2019   12:32:24  ( -70.27, 168.68)    1.80                68
 09/22/2019   03:08:41   ( -70.90, -51.06) 09/22/2019   03:09:51  ( -70.81, -49.92)   42.73                70
 09/22/2019   03:59:17   (  70.37, 117.12) 09/22/2019   03:59:24  (  70.38, 117.08)    1.85                 7
 09/22/2019   04:49:57   ( -70.27, -75.40) 09/22/2019   04:48:53  ( -70.27, -75.44)    1.65                64
 09/24/2019   19:25:09   ( -71.04,  64.60) 09/24/2019   19:26:18  ( -70.92,  66.13)   56.88                69
 09/24/2019   20:15:43   (  70.41,-127.06) 09/24/2019   20:15:53  (  70.38,-127.05)    3.50                10
 09/24/2019   21:06:24   ( -70.30,  40.43) 09/24/2019   21:05:23  ( -70.27,  40.43)    3.02                61
 09/27/2019   11:41:37   ( -71.13,-179.66) 09/27/2019   11:42:46  ( -71.03,-177.83)   66.85                69
 09/27/2019   12:32:09   (  70.39, -11.15) 09/27/2019   12:32:23  (  70.37, -11.18)    2.93                14
 09/27/2019   13:22:50   ( -70.28, 156.35) 09/27/2019   13:21:53  ( -70.27, 156.31)    2.12                57
 09/30/2019   03:58:06   ( -71.27, -64.01) 09/30/2019   03:59:13  ( -71.18, -61.70)   83.05                67
 09/30/2019   04:48:35   (  70.38, 104.76) 09/30/2019   04:48:53  (  70.36, 104.69)    3.54                18
 09/30/2019   05:39:17   ( -70.32, -87.82) 09/30/2019   05:38:22  ( -70.32, -87.74)    2.84                55