Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 10.  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, -60.04) 08/11/2021   03:52:47  ( -71.20, -60.10)    2.84                33
 08/11/2021   04:42:58   (  71.13, 107.37) 08/11/2021   04:42:14  (  71.10, 107.38)    2.66                44
 08/13/2021   20:08:33   ( -71.22,  55.84) 08/13/2021   20:09:17  ( -71.21,  55.78)    2.86                44
 08/13/2021   20:59:16   (  71.11,-136.65) 08/13/2021   20:58:44  (  71.10,-136.74)    3.24                32
 08/16/2021   12:24:52   ( -71.25, 171.73) 08/16/2021   12:25:46  ( -71.26, 171.74)    0.53                54
 08/16/2021   13:15:35   (  71.15, -20.77) 08/16/2021   13:15:13  (  71.15, -20.78)    0.70                22
 08/16/2021   14:06:03   ( -70.32, 147.91) 08/16/2021   14:04:56  ( -70.34, 145.61)   86.18                67
 08/19/2021   04:41:11   ( -71.29, -72.39) 08/19/2021   04:42:15  ( -71.30, -72.30)    3.43                64
 08/19/2021   05:31:54   (  71.18,  95.11) 08/19/2021   05:31:42  (  71.19,  95.17)    2.42                12
 08/19/2021   06:22:29   ( -70.72, -96.79) 08/19/2021   06:21:18  ( -70.77, -97.87)   39.74                71
 08/21/2021   20:57:31   ( -71.43,  43.30) 08/21/2021   20:58:43  ( -71.35,  43.65)   15.35                72
 08/21/2021   21:48:11   (  71.17,-148.92) 08/21/2021   21:48:11  (  71.18,-148.98)    2.55                 0
 08/21/2021   22:38:53   ( -71.07,  18.56) 08/21/2021   22:37:41  ( -71.08,  18.50)    2.48                72