Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 6.  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)
 09/06/2021   23:26:01   (  71.31,-173.49) 09/06/2021   23:27:07  (  71.29,-173.53)    2.47                66
 09/07/2021   00:16:43   ( -71.25,  -6.06) 09/07/2021   00:16:36  ( -71.23,  -5.99)    3.33                 7
 09/07/2021   01:07:19   (  70.74, 162.11) 09/07/2021   01:06:09  (  70.81, 160.99)   41.81                70
 09/09/2021   15:42:23   (  71.52, -57.91) 09/09/2021   15:43:34  (  71.44, -57.41)   19.76                71
 09/09/2021   16:33:01   ( -71.25, 109.88) 09/09/2021   16:33:06  ( -71.22, 109.87)    3.42                 5
 09/09/2021   17:23:44   (  71.10, -82.56) 09/09/2021   17:22:33  (  71.12, -82.65)    3.57                71
 09/12/2021   07:58:49   (  71.93,  57.27) 09/12/2021   07:59:57  (  71.80,  59.08)   64.12                68
 09/12/2021   08:49:19   ( -71.25,-134.17) 09/12/2021   08:49:35  ( -71.26,-134.19)    1.04                16
 09/12/2021   09:40:03   (  71.16,  33.30) 09/12/2021   09:39:02  (  71.15,  33.29)    0.46                61
 09/15/2021   01:05:37   ( -71.30, -18.32) 09/15/2021   01:06:03  ( -71.29, -18.26)    2.71                26
 09/15/2021   01:56:20   (  71.16, 149.24) 09/15/2021   01:55:30  (  71.18, 149.22)    2.95                50
 09/17/2021   17:21:55   ( -71.31,  97.62) 09/17/2021   17:22:32  ( -71.32,  97.67)    1.99                37
 09/17/2021   18:12:39   (  71.21, -94.91) 09/17/2021   18:11:59  (  71.21, -94.86)    1.83                40