Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 9.  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)
 08/11/2021   03:52:14   ( -71.19, -60.05) 08/11/2021   03:52:47  ( -71.20, -60.11)    2.44                33
 08/11/2021   04:42:58   (  71.13, 107.37) 08/11/2021   04:42:14  (  71.10, 107.38)    3.43                44
 08/13/2021   20:08:33   ( -71.23,  55.83) 08/13/2021   20:09:17  ( -71.20,  55.78)    3.21                44
 08/13/2021   20:59:16   (  71.12,-136.66) 08/13/2021   20:58:44  (  71.10,-136.74)    3.50                32
 08/16/2021   12:24:52   ( -71.26, 171.71) 08/16/2021   12:25:46  ( -71.25, 171.74)    1.26                54
 08/16/2021   13:15:35   (  71.15, -20.79) 08/16/2021   13:15:13  (  71.15, -20.79)    0.83                22
 08/16/2021   14:06:03   ( -70.33, 147.90) 08/16/2021   14:04:56  ( -70.34, 145.61)   85.78                67
 08/19/2021   04:41:10   ( -71.25, -72.32) 08/19/2021   04:42:16  ( -71.25, -72.39)    2.69                66
 08/19/2021   05:31:54   (  71.19,  95.09) 08/19/2021   05:31:42  (  71.19,  95.16)    2.54                12
 08/19/2021   06:22:29   ( -70.73, -96.81) 08/19/2021   06:21:18  ( -70.76, -97.87)   39.01                71
 08/21/2021   20:57:31   ( -71.45,  43.28) 08/21/2021   20:58:42  ( -71.40,  43.73)   16.91                71
 08/21/2021   21:48:11   (  71.18,-148.94) 08/21/2021   21:48:11  (  71.18,-148.98)    1.52                 0
 08/21/2021   22:38:53   ( -71.09,  18.54) 08/21/2021   22:37:41  ( -71.08,  18.49)    1.89                72