Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 27.  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)
 07/28/2021   17:40:01   (  71.22, -87.13) 07/28/2021   17:40:50  (  71.21, -87.12)    1.13                49
 07/28/2021   18:30:43   ( -71.12,  80.35) 07/28/2021   18:30:20  ( -71.10,  80.33)    3.00                23
 07/31/2021   09:56:19   (  71.25,  28.76) 07/31/2021   09:57:19  (  71.23,  28.79)    2.23                60
 07/31/2021   10:47:01   ( -71.15,-163.75) 07/31/2021   10:46:49  ( -71.12,-163.75)    3.13                12
 07/31/2021   11:37:34   (  70.52,   4.61) 07/31/2021   11:36:25  (  70.52,   2.98)   60.73                69
 08/03/2021   02:12:38   (  71.27, 144.66) 08/03/2021   02:13:49  (  71.24, 144.69)    3.82                71
 08/03/2021   03:03:19   ( -71.12, -47.76) 08/03/2021   03:03:19  ( -71.14, -47.85)    3.63                 0
 08/03/2021   03:54:00   (  70.91, 119.91) 08/03/2021   03:52:47  (  70.97, 119.54)   14.91                73
 08/05/2021   18:29:04   (  71.66,-100.10) 08/05/2021   18:30:14  (  71.52, -98.98)   42.63                70
 08/05/2021   19:19:38   ( -71.15,  68.14) 08/05/2021   19:19:49  ( -71.15,  68.05)    3.18                11
 08/05/2021   20:10:22   (  71.10,-124.47) 08/05/2021   20:09:15  (  71.09,-124.39)    2.66                67
 08/08/2021   10:45:30   (  72.05,  15.11) 08/08/2021   10:46:36  (  71.96,  17.64)   87.69                66
 08/08/2021   11:35:58   ( -71.22,-176.06) 08/08/2021   11:36:18  ( -71.21,-175.97)    3.44                20
 08/08/2021   12:26:40   (  71.07,  -8.48) 08/08/2021   12:25:45  (  71.10,  -8.51)    2.57                55