Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 7 20.  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)
 07/22/2019   11:59:49   (  70.78,  -3.58) 07/22/2019   12:01:01  (  70.66,  -3.00)   25.42                72
 07/22/2019   12:50:26   ( -70.42, 164.32) 07/22/2019   12:50:33  ( -70.43, 164.30)    1.53                 7
 07/22/2019   13:41:10   (  70.35, -28.26) 07/22/2019   13:40:00  (  70.33, -28.20)    3.14                70
 07/25/2019   04:16:18   (  70.89, 112.12) 07/25/2019   04:17:28  (  70.79, 113.09)   37.05                70
 07/25/2019   05:06:53   ( -70.43, -79.81) 07/25/2019   05:07:03  ( -70.41, -79.85)    2.51                10
 07/25/2019   05:57:36   (  70.30,  87.69) 07/25/2019   05:56:30  (  70.30,  87.64)    2.02                66
 07/27/2019   20:32:45   (  70.95,-132.09) 07/27/2019   20:33:55  (  70.87,-130.90)   44.09                70
 07/27/2019   21:23:19   ( -70.43,  36.07) 07/27/2019   21:23:31  ( -70.44,  36.07)    0.64                12
 07/27/2019   22:14:02   (  70.31,-156.43) 07/27/2019   22:12:58  (  70.33,-156.44)    2.23                64
 07/30/2019   12:49:14   (  71.06, -16.39) 07/30/2019   12:50:23  (  70.95, -14.89)   55.57                69
 07/30/2019   13:39:46   ( -70.44, 151.94) 07/30/2019   13:40:01  ( -70.41, 151.92)    3.19                15
 07/30/2019   14:30:29   (  70.32, -40.56) 07/30/2019   14:29:28  (  70.30, -40.60)    2.27                61
 08/02/2019   05:05:43   (  71.17,  99.30) 08/02/2019   05:06:51  (  71.03, 101.12)   67.10                68
 08/02/2019   05:56:13   ( -70.45, -92.19) 08/02/2019   05:56:30  ( -70.44, -92.16)    1.43                17
 08/02/2019   06:46:56   (  70.33,  75.32) 08/02/2019   06:45:57  (  70.33,  75.33)    0.57                59