Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 11.  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   04:42:58   (  71.13, 107.37) 08/11/2021   04:42:14  (  71.10, 107.38)    2.88                44
 08/13/2021   20:08:33   ( -71.22,  55.84) 08/13/2021   20:09:17  ( -71.20,  55.77)    3.17                44
 08/13/2021   20:59:17   (  71.16,-136.74) 08/13/2021   20:58:43  (  71.16,-136.66)    3.18                34
 08/16/2021   12:24:52   ( -71.25, 171.73) 08/16/2021   12:25:46  ( -71.25, 171.74)    0.26                54
 08/16/2021   13:15:35   (  71.14, -20.77) 08/16/2021   13:15:13  (  71.15, -20.79)    0.98                22
 08/16/2021   14:06:03   ( -70.32, 147.91) 08/16/2021   14:04:56  ( -70.34, 145.61)   86.45                67
 08/19/2021   04:41:11   ( -71.29, -72.38) 08/19/2021   04:42:15  ( -71.30, -72.31)    3.18                64
 08/19/2021   05:31:54   (  71.18,  95.12) 08/19/2021   05:31:42  (  71.19,  95.16)    2.43                12
 08/19/2021   06:22:29   ( -70.72, -96.79) 08/19/2021   06:21:18  ( -70.76, -97.87)   40.17                71
 08/21/2021   20:57:31   ( -71.42,  43.32) 08/21/2021   20:58:43  ( -71.34,  43.64)   14.56                72
 08/21/2021   21:48:11   (  71.16,-148.91) 08/21/2021   21:48:11  (  71.18,-148.98)    3.44                 0
 08/21/2021   22:38:53   ( -71.06,  18.57) 08/21/2021   22:37:41  ( -71.08,  18.49)    3.23                72
 08/24/2021   13:13:57   ( -71.82, 158.54) 08/24/2021   13:15:06  ( -71.70, 160.12)   56.49                69
 08/24/2021   14:04:30   (  71.19, -33.02) 08/24/2021   14:04:40  (  71.21, -33.04)    2.47                10
 08/24/2021   14:55:12   ( -71.10, 134.46) 08/24/2021   14:54:10  ( -71.12, 134.43)    1.98                62