Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 29.  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)
 10/30/2021   15:24:02   ( -71.44, 127.20) 10/30/2021   15:25:12  ( -71.46, 127.21)    1.75                70
 10/30/2021   16:14:46   (  71.35, -65.34) 10/30/2021   16:14:39  (  71.36, -65.30)    1.90                 7
 10/30/2021   17:05:24   ( -71.08, 102.45) 10/30/2021   17:04:11  ( -71.14, 101.97)   18.23                73
 11/02/2021   07:40:26   ( -71.79,-117.49) 11/02/2021   07:41:37  ( -71.66,-116.57)   35.28                71
 11/02/2021   08:31:03   (  71.35,  50.62) 11/02/2021   08:31:08  (  71.35,  50.56)    2.20                 5
 11/02/2021   09:21:45   ( -71.28,-141.94) 11/02/2021   09:20:37  ( -71.28,-141.91)    1.13                68
 11/04/2021   23:56:51   ( -72.19,  -2.30) 11/04/2021   23:57:58  ( -72.06,   0.01)   80.31                67
 11/05/2021   00:47:21   (  71.40, 166.48) 11/05/2021   00:47:36  (  71.37, 166.49)    2.97                15
 11/05/2021   01:38:03   ( -71.32, -26.06) 11/05/2021   01:37:05  ( -71.32, -25.97)    3.22                58
 11/07/2021   17:03:38   (  71.40, -77.57) 11/07/2021   17:04:04  (  71.39, -77.60)    1.24                26
 11/07/2021   17:54:20   ( -71.32,  89.90) 11/07/2021   17:53:33  ( -71.34,  89.95)    3.14                47
 11/10/2021   09:19:54   (  71.40,  38.38) 11/10/2021   09:20:31  (  71.41,  38.31)    2.67                37
 11/10/2021   10:10:37   ( -71.36,-154.23) 11/10/2021   10:10:00  ( -71.36,-154.14)    3.21                37