Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 10.  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)
 12/12/2020   18:04:45   (  71.03, -94.41) 12/12/2020   18:05:57  (  70.92, -93.82)   24.52                72
 12/12/2020   18:55:22   ( -70.68,  73.49) 12/12/2020   18:55:29  ( -70.70,  73.47)    2.23                 7
 12/12/2020   19:46:06   (  70.61,-119.08) 12/12/2020   19:44:56  (  70.59,-119.04)    2.36                70
 12/15/2020   10:21:12   (  71.32,  21.00) 12/15/2020   10:22:21  (  71.17,  22.46)   54.70                69
 12/15/2020   11:11:44   ( -70.71,-170.64) 12/15/2020   11:11:58  ( -70.69,-170.66)    3.05                14
 12/15/2020   12:02:27   (  70.59,  -3.13) 12/15/2020   12:01:25  (  70.58,  -3.18)    2.17                62
 12/18/2020   02:37:38   (  71.57, 136.49) 12/18/2020   02:38:45  (  71.43, 138.75)   81.35                67
 12/18/2020   03:28:05   ( -70.70, -54.69) 12/18/2020   03:28:26  ( -70.72, -54.72)    2.90                21
 12/18/2020   04:18:49   (  70.63, 112.73) 12/18/2020   04:17:53  (  70.61, 112.76)    2.00                56
 12/20/2020   19:44:27   ( -70.74,  61.16) 12/20/2020   19:44:54  ( -70.75,  61.21)    2.20                27
 12/20/2020   20:35:10   (  70.62,-131.33) 12/20/2020   20:34:21  (  70.64,-131.32)    2.58                49
 12/23/2020   12:00:47   ( -70.74, 177.10) 12/23/2020   12:01:22  ( -70.72, 177.04)    2.32                35
 12/23/2020   12:51:31   (  70.66, -15.47) 12/23/2020   12:50:48  (  70.66, -15.40)    2.61                43