Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 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)
 10/22/2021   14:35:10   ( -71.36, 139.49) 10/22/2021   14:35:48  ( -71.36, 139.42)    2.42                38
 10/22/2021   15:25:54   (  71.26, -53.03) 10/22/2021   15:25:15  (  71.27, -53.08)    2.05                39
 10/25/2021   06:51:28   ( -71.40,-104.63) 10/25/2021   06:52:17  ( -71.37,-104.68)    3.37                49
 10/25/2021   07:42:12   (  71.31,  62.84) 10/25/2021   07:41:43  (  71.33,  62.90)    3.22                29
 10/27/2021   23:07:45   ( -71.44,  11.24) 10/27/2021   23:08:44  ( -71.43,  11.29)    2.28                59
 10/27/2021   23:58:28   (  71.31, 178.79) 10/27/2021   23:58:11  (  71.33, 178.78)    2.57                17
 10/28/2021   00:48:59   ( -70.67, -12.80) 10/28/2021   00:47:50  ( -70.73, -14.53)   64.02                69
 10/30/2021   15:24:02   ( -71.44, 127.20) 10/30/2021   15:25:13  ( -71.43, 127.17)    1.78                71
 10/30/2021   16:14:46   (  71.36, -65.35) 10/30/2021   16:14:39  (  71.38, -65.27)    3.49                 7
 10/30/2021   17:05:24   ( -71.08, 102.46) 10/30/2021   17:04:11  ( -71.16, 102.02)   18.08                73
 11/02/2021   07:40:26   ( -71.80,-117.50) 11/02/2021   07:41:37  ( -71.69,-116.52)   36.54                71
 11/02/2021   08:31:03   (  71.37,  50.59) 11/02/2021   08:31:08  (  71.36,  50.59)    0.46                 5
 11/02/2021   09:21:45   ( -71.29,-141.95) 11/02/2021   09:20:38  ( -71.26,-141.94)    3.39                67