Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 17.  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)
 10/17/2021   05:12:05   (  71.96,  99.16) 10/17/2021   05:13:13  (  71.87, 100.89)   60.37                68
 10/17/2021   06:02:35   ( -71.35, -92.39) 10/17/2021   06:02:50  ( -71.32, -92.41)    3.27                15
 10/17/2021   06:53:19   (  71.24,  75.10) 10/17/2021   06:52:17  (  71.23,  75.09)    1.47                62
 10/19/2021   22:18:52   ( -71.33,  23.59) 10/19/2021   22:19:19  ( -71.34,  23.51)    3.32                27
 10/19/2021   23:09:36   (  71.23,-168.92) 10/19/2021   23:08:46  (  71.25,-169.00)    3.39                50
 10/22/2021   14:35:10   ( -71.36, 139.48) 10/22/2021   14:35:48  ( -71.36, 139.42)    2.39                38
 10/22/2021   15:25:54   (  71.27, -53.05) 10/22/2021   15:25:15  (  71.26, -53.10)    2.07                39
 10/25/2021   06:51:28   ( -71.40,-104.64) 10/25/2021   06:52:16  ( -71.42,-104.60)    2.64                48
 10/25/2021   07:42:12   (  71.32,  62.83) 10/25/2021   07:41:43  (  71.32,  62.88)    2.20                29
 10/27/2021   23:07:45   ( -71.44,  11.24) 10/27/2021   23:08:44  ( -71.43,  11.29)    2.57                59
 10/27/2021   23:58:28   (  71.31, 178.79) 10/27/2021   23:58:11  (  71.32, 178.77)    1.48                17
 10/28/2021   00:48:59   ( -70.67, -12.80) 10/28/2021   00:47:50  ( -70.73, -14.54)   63.98                69
 10/30/2021   15:24:02   ( -71.44, 127.20) 10/30/2021   15:25:13  ( -71.43, 127.17)    1.73                71
 10/30/2021   16:14:46   (  71.36, -65.35) 10/30/2021   16:14:39  (  71.37, -65.27)    3.20                 7
 10/30/2021   17:05:24   ( -71.08, 102.46) 10/30/2021   17:04:11  ( -71.16, 102.02)   18.18                73