Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 29.  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)
 05/01/2021   04:28:05   ( -71.41, -70.11) 05/01/2021   04:29:16  ( -71.31, -69.34)   29.73                71
 05/01/2021   05:18:43   (  71.02,  97.89) 05/01/2021   05:18:46  (  71.05,  97.89)    3.42                 3
 05/01/2021   06:09:25   ( -70.95, -94.67) 05/01/2021   06:08:16  ( -70.93, -94.66)    2.00                69
 05/03/2021   20:44:28   ( -71.64,  45.41) 05/03/2021   20:45:38  ( -71.54,  46.92)   54.21                70
 05/03/2021   21:35:02   (  71.04,-146.21) 05/03/2021   21:35:12  (  71.06,-146.21)    2.11                10
 05/03/2021   22:25:44   ( -70.97,  21.22) 05/03/2021   22:24:42  ( -70.95,  21.25)    3.08                62
 05/06/2021   13:00:53   ( -71.93, 160.82) 05/06/2021   13:02:00  ( -71.82, 163.27)   85.50                67
 05/06/2021   13:51:22   (  71.07, -30.32) 05/06/2021   13:51:39  (  71.07, -30.32)    0.07                17
 05/06/2021   14:42:03   ( -70.95, 137.20) 05/06/2021   14:41:09  ( -70.96, 137.14)    2.35                54
 05/09/2021   06:07:42   (  71.09,  85.57) 05/09/2021   06:08:06  (  71.07,  85.56)    2.97                24
 05/09/2021   06:58:23   ( -70.98,-106.91) 05/09/2021   06:57:36  ( -70.96,-106.97)    2.82                47
 05/11/2021   22:24:02   (  71.12,-158.54) 05/11/2021   22:24:32  (  71.12,-158.48)    2.45                30
 05/11/2021   23:14:43   ( -71.01,   8.98) 05/11/2021   23:14:02  ( -71.01,   8.99)    0.92                41