Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 5 1.  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)
 05/03/2019   02:55:34   ( -70.65, -47.20) 05/03/2019   02:56:41  ( -70.65, -47.13)    2.58                67
 05/03/2019   03:46:17   (  70.54, 120.30) 05/03/2019   03:46:07  (  70.55, 120.35)    2.34                10
 05/03/2019   04:36:53   ( -70.17, -71.81) 05/03/2019   04:35:41  ( -70.23, -72.48)   25.96                72
 05/05/2019   19:12:01   ( -70.68,  68.65) 05/05/2019   19:13:12  ( -70.69,  68.78)    5.06                71
 05/05/2019   20:02:44   (  70.51,-123.77) 05/05/2019   20:02:40  (  70.52,-123.82)    2.31                 4
 05/05/2019   20:53:24   ( -70.35,  43.79) 05/05/2019   20:52:11  ( -70.37,  43.59)    7.88                73
 05/08/2019   11:28:32   ( -70.85,-175.76) 05/08/2019   11:29:44  ( -70.77,-175.23)   21.56                72
 05/08/2019   12:19:12   (  70.53,  -7.93) 05/08/2019   12:19:13  (  70.55,  -7.91)    2.66                 1
 05/08/2019   13:09:53   ( -70.43, 159.56) 05/08/2019   13:08:44  ( -70.40, 159.50)    3.16                69
 05/11/2019   03:45:05   ( -71.14, -60.36) 05/11/2019   03:46:14  ( -71.03, -58.98)   51.27                69
 05/11/2019   04:35:40   (  70.56, 107.91) 05/11/2019   04:35:48  (  70.54, 107.91)    2.40                 8
 05/11/2019   05:26:21   ( -70.45, -84.60) 05/11/2019   05:25:18  ( -70.44, -84.59)    0.69                63
 05/13/2019   20:01:37   ( -71.42,  55.03) 05/13/2019   20:02:44  ( -71.28,  57.28)   81.44                67
 05/13/2019   20:52:07   (  70.58,-136.26) 05/13/2019   20:52:22  (  70.57,-136.18)    3.11                15
 05/13/2019   21:42:48   ( -70.47,  31.24) 05/13/2019   21:41:52  ( -70.48,  31.32)    3.22                56