Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 16.  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)
 09/17/2021   17:21:55   ( -71.31,  97.62) 09/17/2021   17:22:32  ( -71.32,  97.66)    1.87                37
 09/17/2021   18:12:39   (  71.21, -94.89) 09/17/2021   18:11:59  (  71.22, -94.84)    2.57                40
 09/20/2021   09:38:13   ( -71.31,-146.44) 09/20/2021   09:39:01  ( -71.34,-146.42)    3.39                48
 09/20/2021   10:28:57   (  71.21,  21.04) 09/20/2021   10:28:29  (  71.19,  20.98)    3.28                28
 09/23/2021   01:54:31   ( -71.32, -30.50) 09/23/2021   01:55:31  ( -71.31, -30.59)    3.37                60
 09/23/2021   02:45:14   (  71.22, 136.98) 09/23/2021   02:44:57  (  71.21, 136.89)    3.38                17
 09/23/2021   03:35:45   ( -70.59, -54.65) 09/23/2021   03:34:36  ( -70.61, -56.41)   64.96                69
 09/25/2021   18:10:49   ( -71.38,  85.34) 09/25/2021   18:11:58  ( -71.38,  85.40)    2.33                69
 09/25/2021   19:01:33   (  71.28,-107.18) 09/25/2021   19:01:25  (  71.27,-107.12)    2.38                 8
 09/25/2021   19:52:10   ( -70.97,  60.68) 09/25/2021   19:50:57  ( -71.06,  60.17)   20.98                73
 09/28/2021   10:27:13   ( -71.70,-159.29) 09/28/2021   10:28:24  ( -71.55,-158.43)   34.33                71
 09/28/2021   11:17:51   (  71.29,   8.75) 09/28/2021   11:17:54  (  71.28,   8.78)    1.42                 3
 09/28/2021   12:08:32   ( -71.18, 176.25) 09/28/2021   12:07:24  ( -71.18, 176.24)    0.99                68