Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 14.  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)
 09/15/2021   01:05:37   ( -71.28, -18.28) 09/15/2021   01:06:04  ( -71.26, -18.31)    3.14                27
 09/15/2021   01:56:21   (  71.18, 149.20) 09/15/2021   01:55:31  (  71.16, 149.18)    2.53                50
 09/17/2021   17:21:55   ( -71.29,  97.65) 09/17/2021   17:22:33  ( -71.28,  97.61)    1.60                38
 09/17/2021   18:12:39   (  71.19, -94.87) 09/17/2021   18:12:00  (  71.19, -94.90)    1.29                39
 09/20/2021   09:38:12   ( -71.30,-146.41) 09/20/2021   09:39:01  ( -71.31,-146.47)    2.30                49
 09/20/2021   10:28:56   (  71.20,  21.07) 09/20/2021   10:28:28  (  71.21,  21.01)    2.09                28
 09/23/2021   01:54:30   ( -71.31, -30.49) 09/23/2021   01:55:30  ( -71.33, -30.56)    3.33                60
 09/23/2021   02:45:14   (  71.21, 136.99) 09/23/2021   02:44:57  (  71.22, 136.92)    3.01                17
 09/23/2021   03:35:45   ( -70.58, -54.63) 09/23/2021   03:34:36  ( -70.63, -56.38)   64.61                69
 09/25/2021   18:10:49   ( -71.37,  85.35) 09/25/2021   18:11:59  ( -71.34,  85.34)    3.57                70
 09/25/2021   19:01:33   (  71.28,-107.17) 09/25/2021   19:01:25  (  71.29,-107.09)    3.27                 8
 09/25/2021   19:52:10   ( -70.96,  60.69) 09/25/2021   19:50:58  ( -71.02,  60.11)   21.90                72