Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 13.  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)
 05/13/2019   20:01:28   ( -70.93,  55.87) 05/13/2019   20:02:39  ( -70.82,  56.72)   33.17                71
 05/13/2019   20:52:06   (  70.50,-136.11) 05/13/2019   20:52:10  (  70.50,-136.13)    0.55                 4
 05/13/2019   21:42:47   ( -70.40,  31.36) 05/13/2019   21:41:40  ( -70.39,  31.35)    0.62                67
 05/16/2019   12:17:57   ( -71.06, 171.53) 05/16/2019   12:19:07  ( -70.94, 172.78)   47.19                70
 05/16/2019   13:08:33   (  70.53, -20.28) 05/16/2019   13:08:40  (  70.51, -20.24)    2.75                 7
 05/16/2019   13:59:14   ( -70.43, 147.20) 05/16/2019   13:58:10  ( -70.41, 147.25)    2.75                64
 05/19/2019   04:34:27   ( -71.20, -72.81) 05/19/2019   04:35:36  ( -71.07, -71.14)   61.69                69
 05/19/2019   05:25:00   (  70.51,  95.63) 05/19/2019   05:25:11  (  70.52,  95.66)    1.98                11
 05/19/2019   06:15:41   ( -70.40, -96.88) 05/19/2019   06:14:41  ( -70.43, -96.85)    2.76                60
 05/21/2019   20:50:57   ( -71.33,  42.83) 05/21/2019   20:52:04  ( -71.26,  45.03)   78.68                67
 05/21/2019   21:41:27   (  70.49,-148.46) 05/21/2019   21:41:43  (  70.49,-148.51)    2.00                16
 05/21/2019   22:32:08   ( -70.38,  19.03) 05/21/2019   22:31:13  ( -70.39,  18.98)    2.39                55
 05/24/2019   13:07:27   ( -71.47, 158.48) 05/24/2019   13:08:33  ( -71.39, 161.12)   94.11                66
 05/24/2019   13:57:55   (  70.53, -32.64) 05/24/2019   13:58:14  (  70.52, -32.60)    2.41                19
 05/24/2019   14:48:36   ( -70.42, 134.86) 05/24/2019   14:47:44  ( -70.42, 134.89)    1.31                52