Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 19.  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)
 05/19/2019   04:34:26   ( -71.16, -72.75) 05/19/2019   04:35:35  ( -71.05, -71.17)   58.24                69
 05/19/2019   05:25:00   (  70.52,  95.61) 05/19/2019   05:25:10  (  70.51,  95.64)    1.68                10
 05/19/2019   06:15:41   ( -70.42, -96.91) 05/19/2019   06:14:40  ( -70.40, -96.88)    2.08                61
 05/21/2019   20:50:56   ( -71.30,  42.89) 05/21/2019   20:52:04  ( -71.14,  44.85)   72.23                68
 05/21/2019   21:41:27   (  70.50,-148.48) 05/21/2019   21:41:41  (  70.49,-148.51)    1.90                14
 05/21/2019   22:32:08   ( -70.40,  19.01) 05/21/2019   22:31:11  ( -70.39,  18.98)    1.60                57
 05/24/2019   13:07:25   ( -71.38, 158.62) 05/24/2019   13:08:32  ( -71.29, 160.96)   83.96                67
 05/24/2019   13:57:54   (  70.49, -32.58) 05/24/2019   13:58:11  (  70.52, -32.58)    3.30                17
 05/24/2019   14:48:36   ( -70.44, 134.83) 05/24/2019   14:47:41  ( -70.43, 134.91)    3.20                55
 05/27/2019   06:14:21   (  70.49,  83.32) 05/27/2019   06:14:42  (  70.50,  83.26)    2.42                21
 05/27/2019   07:05:03   ( -70.42,-109.26) 05/27/2019   07:04:12  ( -70.40,-109.25)    2.41                51
 05/29/2019   22:30:48   (  70.53,-160.88) 05/29/2019   22:31:11  (  70.53,-160.82)    2.34                23
 05/29/2019   23:21:29   ( -70.41,   6.64) 05/29/2019   23:20:41  ( -70.43,   6.67)    2.44                48
 06/01/2019   14:47:14   (  70.48, -44.91) 06/01/2019   14:47:42  (  70.49, -44.99)    3.45                28
 06/01/2019   15:37:56   ( -70.40, 122.53) 06/01/2019   15:37:12  ( -70.40, 122.51)    1.06                44