Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 15.  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)
 05/16/2019   12:17:57   ( -71.04, 171.56) 05/16/2019   12:19:07  ( -70.93, 172.77)   45.39                70
 05/16/2019   13:08:33   (  70.50, -20.24) 05/16/2019   13:08:40  (  70.50, -20.24)    0.21                 7
 05/16/2019   13:59:14   ( -70.41, 147.23) 05/16/2019   13:58:10  ( -70.39, 147.24)    1.35                64
 05/19/2019   04:34:27   ( -71.17, -72.77) 05/19/2019   04:35:36  ( -71.02, -71.21)   58.64                69
 05/19/2019   05:25:00   (  70.48,  95.68) 05/19/2019   05:25:11  (  70.48,  95.60)    2.84                11
 05/19/2019   06:15:41   ( -70.38, -96.84) 05/19/2019   06:14:41  ( -70.38, -96.91)    2.64                60
 05/21/2019   20:50:56   ( -71.25,  42.98) 05/21/2019   20:52:04  ( -71.16,  44.89)   68.99                68
 05/21/2019   21:41:27   (  70.51,-148.48) 05/21/2019   21:41:40  (  70.51,-148.48)    0.27                13
 05/21/2019   22:32:08   ( -70.40,  19.00) 05/21/2019   22:31:10  ( -70.41,  19.01)    0.41                58
 05/24/2019   13:07:25   ( -71.37, 158.64) 05/24/2019   13:08:32  ( -71.23, 160.88)   81.50                67
 05/24/2019   13:57:55   (  70.54, -32.65) 05/24/2019   13:58:10  (  70.52, -32.57)    3.19                15
 05/24/2019   14:48:36   ( -70.43, 134.85) 05/24/2019   14:47:40  ( -70.43, 134.92)    2.65                56
 05/27/2019   05:23:54   ( -71.45, -85.61) 05/27/2019   05:25:00  ( -71.35, -83.04)   91.74                66
 05/27/2019   06:14:22   (  70.51,  83.27) 05/27/2019   06:14:40  (  70.53,  83.32)    3.11                18
 05/27/2019   07:05:03   ( -70.40,-109.23) 05/27/2019   07:04:11  ( -70.38,-109.27)    2.15                52