Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 10.  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)
 05/11/2019   03:44:59   ( -70.83, -59.84) 05/11/2019   03:46:10  ( -70.75, -59.27)   22.79                71
 05/11/2019   04:35:39   (  70.50, 108.00) 05/11/2019   04:35:40  (  70.48, 107.97)    2.45                 1
 05/11/2019   05:26:20   ( -70.40, -84.52) 05/11/2019   05:25:10  ( -70.38, -84.55)    3.10                70
 05/13/2019   20:01:28   ( -70.96,  55.83) 05/13/2019   20:02:39  ( -70.84,  56.75)   35.79                71
 05/13/2019   20:52:06   (  70.53,-136.16) 05/13/2019   20:52:10  (  70.52,-136.10)    2.34                 4
 05/13/2019   21:42:47   ( -70.42,  31.32) 05/13/2019   21:41:40  ( -70.42,  31.38)    2.46                67
 05/16/2019   12:17:59   ( -71.14, 171.41) 05/16/2019   12:19:08  ( -71.01, 172.88)   55.00                69
 05/16/2019   13:08:33   (  70.50, -20.24) 05/16/2019   13:08:42  (  70.52, -20.23)    2.17                 9
 05/16/2019   13:59:14   ( -70.40, 147.25) 05/16/2019   13:58:12  ( -70.42, 147.26)    2.97                62
 05/19/2019   04:34:29   ( -71.26, -72.93) 05/19/2019   04:35:37  ( -71.20, -70.96)   71.17                68
 05/19/2019   05:25:01   (  70.53,  95.60) 05/19/2019   05:25:14  (  70.54,  95.67)    3.06                13
 05/19/2019   06:15:42   ( -70.42, -96.91) 05/19/2019   06:14:45  ( -70.39, -96.91)    3.29                57
 05/21/2019   20:51:00   ( -71.44,  42.63) 05/21/2019   20:52:07  ( -71.34,  45.15)   90.08                67
 05/21/2019   21:41:28   (  70.51,-148.48) 05/21/2019   21:41:47  (  70.52,-148.48)    1.99                19
 05/21/2019   22:32:10   ( -70.44,  18.93) 05/21/2019   22:31:17  ( -70.43,  19.02)    3.40                53