Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 28.  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   17:40:00   (  71.19, -87.08) 07/28/2021   17:40:50  (  71.19, -87.15)    2.62                50
 07/28/2021   18:30:43   ( -71.15,  80.31) 07/28/2021   18:30:19  ( -71.13,  80.38)    3.23                24
 07/31/2021   09:56:19   (  71.22,  28.81) 07/31/2021   09:57:20  (  71.21,  28.75)    2.38                61
 07/31/2021   10:47:01   ( -71.12,-163.70) 07/31/2021   10:46:49  ( -71.15,-163.70)    3.55                12
 07/31/2021   11:37:34   (  70.49,   4.66) 07/31/2021   11:36:25  (  70.56,   3.03)   61.08                69
 08/03/2021   02:12:37   (  71.25, 144.70) 08/03/2021   02:13:48  (  71.27, 144.74)    3.22                71
 08/03/2021   03:03:19   ( -71.15, -47.81) 08/03/2021   03:03:18  ( -71.17, -47.80)    2.33                 1
 08/03/2021   03:53:59   (  70.89, 119.95) 08/03/2021   03:52:47  (  70.95, 119.51)   17.72                72
 08/05/2021   18:29:03   (  71.64,-100.06) 08/05/2021   18:30:13  (  71.55, -98.92)   41.05                70
 08/05/2021   19:19:38   ( -71.18,  68.09) 08/05/2021   19:19:48  ( -71.18,  68.10)    0.49                10
 08/05/2021   20:10:21   (  71.07,-124.42) 08/05/2021   20:09:15  (  71.07,-124.43)    0.55                66
 08/08/2021   10:45:29   (  72.03,  15.15) 08/08/2021   10:46:36  (  71.93,  17.60)   85.15                67
 08/08/2021   11:35:57   ( -71.21,-176.02) 08/08/2021   11:36:18  ( -71.18,-176.01)    2.53                21
 08/08/2021   12:26:40   (  71.11,  -8.54) 08/08/2021   12:25:44  (  71.13,  -8.46)    3.53                56