Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 20.  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)
 08/21/2021   20:57:31   ( -71.42,  43.33) 08/21/2021   20:58:43  ( -71.37,  43.69)   13.85                72
 08/21/2021   21:48:12   (  71.20,-148.97) 08/21/2021   21:48:11  (  71.22,-148.92)    2.99                 1
 08/21/2021   22:38:54   ( -71.11,  18.50) 08/21/2021   22:37:41  ( -71.11,  18.54)    1.76                73
 08/24/2021   13:13:57   ( -71.82, 158.54) 08/24/2021   13:15:06  ( -71.74, 160.17)   57.64                69
 08/24/2021   14:04:30   (  71.19, -33.01) 08/24/2021   14:04:41  (  71.20, -33.06)    2.65                11
 08/24/2021   14:55:12   ( -71.10, 134.46) 08/24/2021   14:54:11  ( -71.09, 134.40)    2.41                61
 08/27/2021   06:20:48   (  71.23,  82.86) 08/27/2021   06:21:09  (  71.24,  82.87)    0.80                21
 08/27/2021   07:11:30   ( -71.15,-109.67) 08/27/2021   07:10:39  ( -71.13,-109.66)    1.83                51
 08/29/2021   22:37:07   (  71.27,-161.27) 08/29/2021   22:37:38  (  71.27,-161.20)    2.66                31
 08/29/2021   23:27:48   ( -71.14,   6.28) 08/29/2021   23:27:08  ( -71.16,   6.27)    2.69                40
 09/01/2021   14:53:25   (  71.27, -45.31) 09/01/2021   14:54:07  (  71.29, -45.27)    3.28                42
 09/01/2021   15:44:07   ( -71.19, 122.15) 09/01/2021   15:43:37  ( -71.19, 122.20)    1.94                30