Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 21.  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)
 09/23/2021   01:54:30   ( -71.31, -30.50) 09/23/2021   01:55:30  ( -71.32, -30.58)    2.94                60
 09/23/2021   02:45:14   (  71.21, 137.00) 09/23/2021   02:44:57  (  71.22, 136.92)    3.41                17
 09/23/2021   03:35:45   ( -70.59, -54.64) 09/23/2021   03:34:36  ( -70.62, -56.39)   64.80                69
 09/25/2021   18:10:49   ( -71.37,  85.34) 09/25/2021   18:11:58  ( -71.38,  85.41)    2.74                69
 09/25/2021   19:01:33   (  71.27,-107.16) 09/25/2021   19:01:25  (  71.29,-107.10)    3.11                 8
 09/25/2021   19:52:10   ( -70.96,  60.69) 09/25/2021   19:50:58  ( -71.01,  60.09)   22.02                72
 09/28/2021   10:27:13   ( -71.69,-159.29) 09/28/2021   10:28:24  ( -71.56,-158.42)   34.06                71
 09/28/2021   11:17:51   (  71.28,   8.76) 09/28/2021   11:17:54  (  71.29,   8.79)    1.76                 3
 09/28/2021   12:08:32   ( -71.18, 176.26) 09/28/2021   12:07:24  ( -71.18, 176.25)    0.38                68
 10/01/2021   02:43:37   ( -72.06, -44.04) 10/01/2021   02:44:44  ( -71.99, -41.80)   77.32                67
 10/01/2021   03:34:08   (  71.30, 124.68) 10/01/2021   03:34:22  (  71.30, 124.68)    0.19                14
 10/01/2021   04:24:49   ( -71.20, -67.82) 10/01/2021   04:23:52  ( -71.19, -67.86)    1.97                57
 10/03/2021   19:50:26   (  71.31,-119.40) 10/03/2021   19:50:51  (  71.29,-119.44)    2.79                25
 10/03/2021   20:41:07   ( -71.21,  48.11) 10/03/2021   20:40:20  ( -71.24,  48.10)    3.37                47