Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 16.  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   ( -71.03, 171.59) 05/16/2019   12:19:07  ( -70.95, 172.80)   44.71                70
 05/16/2019   13:08:33   (  70.49, -20.22) 05/16/2019   13:08:40  (  70.52, -20.22)    3.41                 7
 05/16/2019   13:59:14   ( -70.39, 147.26) 05/16/2019   13:58:10  ( -70.41, 147.26)    2.28                64
 05/19/2019   04:34:26   ( -71.16, -72.75) 05/19/2019   04:35:35  ( -71.04, -71.18)   57.96                69
 05/19/2019   05:25:00   (  70.52,  95.62) 05/19/2019   05:25:10  (  70.50,  95.64)    1.93                10
 05/19/2019   06:15:41   ( -70.42, -96.90) 05/19/2019   06:14:40  ( -70.40, -96.88)    2.26                61
 05/21/2019   20:50:55   ( -71.23,  43.00) 05/21/2019   20:52:04  ( -71.13,  44.84)   66.72                69
 05/21/2019   21:41:27   (  70.49,-148.46) 05/21/2019   21:41:41  (  70.47,-148.53)    3.27                14
 05/21/2019   22:32:08   ( -70.39,  19.02) 05/21/2019   22:31:11  ( -70.37,  18.96)    2.86                57
 05/24/2019   13:07:25   ( -71.36, 158.67) 05/24/2019   13:08:32  ( -71.26, 160.92)   81.28                67
 05/24/2019   13:57:55   (  70.52, -32.63) 05/24/2019   13:58:11  (  70.49, -32.62)    3.24                16
 05/24/2019   14:48:36   ( -70.41, 134.87) 05/24/2019   14:47:41  ( -70.40, 134.87)    1.81                55
 05/27/2019   05:23:54   ( -71.43, -85.59) 05/27/2019   05:25:01  ( -71.33, -83.09)   89.52                67
 05/27/2019   06:14:22   (  70.50,  83.29) 05/27/2019   06:14:41  (  70.50,  83.28)    0.81                19
 05/27/2019   07:05:03   ( -70.38,-109.20) 05/27/2019   07:04:11  ( -70.41,-109.23)    3.03                52
 05/29/2019   22:30:49   (  70.53,-160.87) 05/29/2019   22:31:10  (  70.51,-160.83)    2.63                21
 05/29/2019   23:21:30   ( -70.41,   6.64) 05/29/2019   23:20:40  ( -70.41,   6.66)    1.07                50