Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 7.  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)
 05/08/2019   11:28:29   ( -70.70,-175.51) 05/08/2019   11:29:40  ( -70.67,-175.27)    9.70                71
 05/08/2019   12:19:12   (  70.53,  -7.93) 05/08/2019   12:19:08  (  70.51,  -7.87)    3.33                 4
 05/08/2019   13:09:52   ( -70.38, 159.63) 05/08/2019   13:08:38  ( -70.40, 159.61)    2.71                74
 05/11/2019   03:44:59   ( -70.83, -59.84) 05/11/2019   03:46:10  ( -70.73, -59.30)   22.66                71
 05/11/2019   04:35:39   (  70.50, 108.00) 05/11/2019   04:35:39  (  70.51, 108.02)    1.20                 0
 05/11/2019   05:26:20   ( -70.40, -84.52) 05/11/2019   05:25:09  ( -70.41, -84.50)    1.23                71
 05/13/2019   20:01:28   ( -70.96,  55.83) 05/13/2019   20:02:39  ( -70.80,  56.69)   35.69                71
 05/13/2019   20:52:06   (  70.53,-136.16) 05/13/2019   20:52:09  (  70.53,-136.08)    2.98                 3
 05/13/2019   21:42:46   ( -70.37,  31.40) 05/13/2019   21:41:40  ( -70.37,  31.32)    3.06                66
 05/16/2019   12:17:58   ( -71.08, 171.49) 05/16/2019   12:19:08  ( -70.94, 172.78)   49.17                70
 05/16/2019   13:08:33   (  70.50, -20.24) 05/16/2019   13:08:41  (  70.50, -20.25)    0.69                 8
 05/16/2019   13:59:14   ( -70.40, 147.25) 05/16/2019   13:58:11  ( -70.40, 147.24)    0.80                63
 05/19/2019   04:34:28   ( -71.21, -72.85) 05/19/2019   04:35:37  ( -71.09, -71.12)   63.82                69
 05/19/2019   05:25:00   (  70.48,  95.67) 05/19/2019   05:25:13  (  70.48,  95.60)    2.63                13
 05/19/2019   06:15:41   ( -70.37, -96.83) 05/19/2019   06:14:43  ( -70.39, -96.90)    3.52                58