Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 21.  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)
 05/21/2019   20:50:56   ( -71.28,  42.92) 05/21/2019   20:52:04  ( -71.15,  44.87)   71.07                68
 05/21/2019   21:41:27   (  70.49,-148.45) 05/21/2019   21:41:41  (  70.50,-148.49)    2.18                14
 05/21/2019   22:32:08   ( -70.38,  19.03) 05/21/2019   22:31:11  ( -70.40,  18.99)    2.20                57
 05/24/2019   13:07:25   ( -71.36, 158.67) 05/24/2019   13:08:32  ( -71.29, 160.98)   82.58                67
 05/24/2019   13:57:55   (  70.52, -32.62) 05/24/2019   13:58:11  (  70.53, -32.56)    2.59                16
 05/24/2019   14:48:36   ( -70.41, 134.87) 05/24/2019   14:47:41  ( -70.43, 134.92)    2.91                55
 05/27/2019   05:23:54   ( -71.49, -85.69) 05/27/2019   05:25:00  ( -71.38, -83.01)   95.67                66
 05/27/2019   06:14:21   (  70.50,  83.29) 05/27/2019   06:14:41  (  70.51,  83.28)    0.52                20
 05/27/2019   07:05:02   ( -70.39,-109.21) 05/27/2019   07:04:11  ( -70.41,-109.24)    2.21                51
 05/29/2019   22:30:49   (  70.54,-160.89) 05/29/2019   22:31:11  (  70.53,-160.81)    3.14                22
 05/29/2019   23:21:30   ( -70.42,   6.62) 05/29/2019   23:20:41  ( -70.43,   6.68)    2.73                49
 06/01/2019   14:47:16   (  70.52, -44.98) 06/01/2019   14:47:42  (  70.50, -44.98)    3.11                26
 06/01/2019   15:37:57   ( -70.40, 122.54) 06/01/2019   15:37:12  ( -70.40, 122.51)    0.93                45