Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 18.  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)
 10/19/2021   22:18:53   ( -71.36,  23.54) 10/19/2021   22:19:19  ( -71.36,  23.54)    0.60                26
 10/19/2021   23:09:37   (  71.26,-168.97) 10/19/2021   23:08:46  (  71.27,-168.96)    1.72                51
 10/22/2021   14:35:11   ( -71.39, 139.43) 10/22/2021   14:35:48  ( -71.38, 139.45)    1.63                37
 10/22/2021   15:25:55   (  71.30, -53.09) 10/22/2021   15:25:15  (  71.28, -53.06)    1.98                40
 10/25/2021   06:51:27   ( -71.38,-104.59) 10/25/2021   06:52:16  ( -71.39,-104.65)    2.48                49
 10/25/2021   07:42:11   (  71.29,  62.87) 10/25/2021   07:41:43  (  71.29,  62.83)    1.49                28
 10/27/2021   23:07:45   ( -71.42,  11.29) 10/27/2021   23:08:44  ( -71.45,  11.32)    3.21                59
 10/27/2021   23:58:29   (  71.34, 178.74) 10/27/2021   23:58:11  (  71.34, 178.80)    2.16                18
 10/28/2021   00:48:59   ( -70.65, -12.76) 10/28/2021   00:47:50  ( -70.75, -14.51)   65.25                69
 10/30/2021   15:24:03   ( -71.46, 127.16) 10/30/2021   15:25:13  ( -71.44, 127.19)    2.51                70
 10/30/2021   16:14:46   (  71.34, -65.30) 10/30/2021   16:14:40  (  71.34, -65.33)    1.01                 6
 10/30/2021   17:05:24   ( -71.05, 102.51) 10/30/2021   17:04:12  ( -71.12, 101.96)   21.26                72