Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 22.  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   14:35:11   ( -71.39, 139.43) 10/22/2021   14:35:48  ( -71.38, 139.45)    1.75                37
 10/22/2021   15:25:54   (  71.30, -53.09) 10/22/2021   15:25:14  (  71.29, -53.05)    1.38                40
 10/25/2021   06:51:27   ( -71.38,-104.59) 10/25/2021   06:52:16  ( -71.39,-104.66)    2.61                49
 10/25/2021   07:42:11   (  71.29,  62.88) 10/25/2021   07:41:43  (  71.30,  62.84)    1.87                28
 10/27/2021   23:07:45   ( -71.42,  11.29) 10/27/2021   23:08:45  ( -71.39,  11.23)    3.43                60
 10/27/2021   23:58:29   (  71.33, 178.75) 10/27/2021   23:58:11  (  71.35, 178.80)    2.73                18
 10/28/2021   00:48:59   ( -70.64, -12.76) 10/28/2021   00:47:50  ( -70.75, -14.51)   65.52                69
 10/30/2021   15:24:03   ( -71.46, 127.17) 10/30/2021   15:25:13  ( -71.44, 127.19)    1.73                70
 10/30/2021   16:14:46   (  71.33, -65.29) 10/30/2021   16:14:40  (  71.34, -65.32)    2.17                 6
 10/30/2021   17:05:24   ( -71.05, 102.52) 10/30/2021   17:04:12  ( -71.12, 101.96)   21.82                72
 11/02/2021   07:40:26   ( -71.81,-117.52) 11/02/2021   07:41:36  ( -71.70,-116.49)   37.81                70
 11/02/2021   08:31:03   (  71.38,  50.57) 11/02/2021   08:31:07  (  71.38,  50.62)    1.96                 4
 11/02/2021   09:21:45   ( -71.30,-141.97) 11/02/2021   09:20:37  ( -71.28,-141.92)    3.08                68
 11/04/2021   23:56:51   ( -72.21,  -2.34) 11/04/2021   23:57:58  ( -72.06,   0.01)   82.06                67
 11/05/2021   00:47:20   (  71.38, 166.53) 11/05/2021   00:47:36  (  71.37, 166.48)    2.19                16
 11/05/2021   01:38:02   ( -71.29, -26.01) 11/05/2021   01:37:05  ( -71.31, -25.97)    2.71                57