Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 21.  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)
 10/22/2021   14:35:10   ( -71.39, 139.44) 10/22/2021   14:35:47  ( -71.39, 139.46)    0.82                37
 10/22/2021   15:25:54   (  71.29, -53.08) 10/22/2021   15:25:14  (  71.30, -53.04)    1.70                40
 10/25/2021   06:51:28   ( -71.43,-104.68) 10/25/2021   06:52:16  ( -71.40,-104.64)    3.27                48
 10/25/2021   07:42:11   (  71.28,  62.89) 10/25/2021   07:41:43  (  71.30,  62.85)    2.66                28
 10/27/2021   23:07:45   ( -71.42,  11.29) 10/27/2021   23:08:45  ( -71.40,  11.24)    2.39                60
 10/27/2021   23:58:29   (  71.33, 178.75) 10/27/2021   23:58:12  (  71.30, 178.73)    3.37                17
 10/28/2021   00:49:00   ( -70.70, -12.84) 10/28/2021   00:47:51  ( -70.70, -14.58)   63.92                69
 10/30/2021   15:24:03   ( -71.46, 127.16) 10/30/2021   15:25:13  ( -71.45, 127.21)    1.99                70
 10/30/2021   16:14:46   (  71.33, -65.30) 10/30/2021   16:14:40  (  71.35, -65.31)    1.93                 6
 10/30/2021   17:05:25   ( -71.10, 102.42) 10/30/2021   17:04:12  ( -71.13, 101.97)   16.49                73
 11/02/2021   07:40:26   ( -71.82,-117.54) 11/02/2021   07:41:36  ( -71.71,-116.48)   38.86                70
 11/02/2021   08:31:03   (  71.39,  50.56) 11/02/2021   08:31:07  (  71.39,  50.63)    2.67                 4
 11/02/2021   09:21:44   ( -71.26,-141.89) 11/02/2021   09:20:37  ( -71.28,-141.91)    2.71                67