Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 24.  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)
 10/25/2021   06:51:28   ( -71.42,-104.66) 10/25/2021   06:52:16  ( -71.40,-104.64)    1.85                48
 10/25/2021   07:42:12   (  71.32,  62.82) 10/25/2021   07:41:43  (  71.31,  62.86)    2.03                29
 10/27/2021   23:07:45   ( -71.40,  11.32) 10/27/2021   23:08:45  ( -71.40,  11.25)    2.59                60
 10/27/2021   23:58:29   (  71.31, 178.78) 10/27/2021   23:58:12  (  71.31, 178.74)    1.66                17
 10/28/2021   00:49:00   ( -70.68, -12.82) 10/28/2021   00:47:51  ( -70.70, -14.58)   64.82                69
 10/30/2021   15:24:02   ( -71.44, 127.20) 10/30/2021   15:25:12  ( -71.46, 127.21)    2.22                70
 10/30/2021   16:14:46   (  71.36, -65.34) 10/30/2021   16:14:39  (  71.36, -65.30)    1.40                 7
 10/30/2021   17:05:24   ( -71.08, 102.46) 10/30/2021   17:04:11  ( -71.14, 101.98)   18.60                73
 11/02/2021   07:40:26   ( -71.78,-117.48) 11/02/2021   07:41:37  ( -71.66,-116.56)   34.68                71
 11/02/2021   08:31:03   (  71.35,  50.62) 11/02/2021   08:31:08  (  71.35,  50.56)    2.28                 5
 11/02/2021   09:21:45   ( -71.27,-141.92) 11/02/2021   09:20:37  ( -71.29,-141.90)    2.03                68
 11/04/2021   23:56:51   ( -72.18,  -2.28) 11/04/2021   23:57:58  ( -72.08,   0.04)   80.06                67
 11/05/2021   00:47:21   (  71.40, 166.49) 11/05/2021   00:47:36  (  71.38, 166.50)    1.74                15
 11/05/2021   01:38:02   ( -71.26, -25.95) 11/05/2021   01:37:06  ( -71.27, -26.04)    3.40                56