Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 8.  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   ( -70.71,-175.52) 05/08/2019   11:29:40  ( -70.67,-175.27)   10.34                71
 05/08/2019   12:19:11   (  70.48,  -7.85) 05/08/2019   12:19:08  (  70.51,  -7.86)    3.38                 3
 05/08/2019   13:09:52   ( -70.38, 159.62) 05/08/2019   13:08:38  ( -70.40, 159.62)    2.37                74
 05/11/2019   03:44:59   ( -70.84, -59.85) 05/11/2019   03:46:10  ( -70.74, -59.28)   23.41                71
 05/11/2019   04:35:39   (  70.51, 107.99) 05/11/2019   04:35:39  (  70.53, 108.04)    3.01                 0
 05/11/2019   05:26:20   ( -70.41, -84.53) 05/11/2019   05:25:09  ( -70.43, -84.48)    2.88                71
 05/13/2019   20:01:28   ( -70.97,  55.81) 05/13/2019   20:02:39  ( -70.83,  56.74)   36.67                71
 05/13/2019   20:52:05   (  70.49,-136.10) 05/13/2019   20:52:10  (  70.51,-136.12)    2.43                 5
 05/13/2019   21:42:46   ( -70.38,  31.39) 05/13/2019   21:41:40  ( -70.41,  31.37)    2.92                66
 05/16/2019   12:17:58   ( -71.10, 171.47) 05/16/2019   12:19:08  ( -70.99, 172.86)   51.39                70
 05/16/2019   13:08:33   (  70.52, -20.26) 05/16/2019   13:08:42  (  70.50, -20.25)    1.89                 9
 05/16/2019   13:59:14   ( -70.41, 147.23) 05/16/2019   13:58:12  ( -70.41, 147.24)    0.72                62
 05/19/2019   04:34:29   ( -71.28, -72.97) 05/19/2019   04:35:37  ( -71.17, -70.99)   71.71                68
 05/19/2019   05:25:00   (  70.50,  95.65) 05/19/2019   05:25:14  (  70.51,  95.64)    1.53                14
 05/19/2019   06:15:42   ( -70.44, -96.94) 05/19/2019   06:14:44  ( -70.42, -96.87)    3.49                58
 05/21/2019   20:51:00   ( -71.47,  42.59) 05/21/2019   20:52:06  ( -71.36,  45.19)   92.81                66
 05/21/2019   21:41:28   (  70.53,-148.53) 05/21/2019   21:41:46  (  70.54,-148.45)    2.88                18
 05/21/2019   22:32:09   ( -70.42,  18.98) 05/21/2019   22:31:17  ( -70.39,  18.96)    2.83                52