Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 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)
 08/16/2021   12:24:52   ( -71.26, 171.72) 08/16/2021   12:25:46  ( -71.26, 171.74)    0.73                54
 08/16/2021   13:15:35   (  71.14, -20.77) 08/16/2021   13:15:13  (  71.16, -20.77)    1.61                22
 08/16/2021   14:06:03   ( -70.33, 147.91) 08/16/2021   14:04:56  ( -70.34, 145.61)   85.94                67
 08/19/2021   04:41:10   ( -71.24, -72.31) 08/19/2021   04:42:16  ( -71.25, -72.39)    2.97                66
 08/19/2021   05:31:53   (  71.18,  95.11) 08/19/2021   05:31:41  (  71.20,  95.18)    3.34                12
 08/19/2021   06:22:28   ( -70.73, -96.80) 08/19/2021   06:21:17  ( -70.77, -97.86)   39.29                71
 08/21/2021   20:57:31   ( -71.44,  43.29) 08/21/2021   20:58:43  ( -71.35,  43.65)   16.03                72
 08/21/2021   21:48:11   (  71.17,-148.92) 08/21/2021   21:48:11  (  71.19,-148.96)    2.74                 0
 08/21/2021   22:38:53   ( -71.08,  18.55) 08/21/2021   22:37:41  ( -71.09,  18.51)    1.76                72
 08/24/2021   13:13:57   ( -71.84, 158.50) 08/24/2021   13:15:06  ( -71.71, 160.14)   58.48                69
 08/24/2021   14:04:30   (  71.21, -33.05) 08/24/2021   14:04:40  (  71.23, -33.02)    2.23                10
 08/24/2021   14:55:12   ( -71.12, 134.43) 08/24/2021   14:54:10  ( -71.13, 134.45)    1.12                62
 08/27/2021   06:20:48   (  71.20,  82.92) 08/27/2021   06:21:10  (  71.21,  82.83)    3.24                22
 08/27/2021   07:11:30   ( -71.11,-109.61) 08/27/2021   07:10:40  ( -71.11,-109.70)    2.98                50