Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 1.  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, -69.33)   29.59                71
 05/01/2021   05:18:44   (  71.06,  97.81) 05/01/2021   05:18:46  (  71.05,  97.90)    3.31                 2
 05/01/2021   06:09:25   ( -70.95, -94.67) 05/01/2021   06:08:16  ( -70.93, -94.65)    1.55                69
 05/03/2021   20:44:29   ( -71.69,  45.32) 05/03/2021   20:45:38  ( -71.54,  46.92)   58.61                69
 05/03/2021   21:35:02   (  71.03,-146.20) 05/03/2021   21:35:12  (  71.07,-146.20)    3.45                10
 05/03/2021   22:25:44   ( -70.97,  21.23) 05/03/2021   22:24:42  ( -70.95,  21.25)    2.44                62
 05/06/2021   13:00:53   ( -71.92, 160.83) 05/06/2021   13:02:00  ( -71.82, 163.28)   85.36                67
 05/06/2021   13:51:22   (  71.06, -30.31) 05/06/2021   13:51:39  (  71.07, -30.31)    1.56                17
 05/06/2021   14:42:03   ( -70.94, 137.21) 05/06/2021   14:41:09  ( -70.96, 137.15)    2.90                54
 05/09/2021   06:07:42   (  71.09,  85.59) 05/09/2021   06:08:06  (  71.08,  85.57)    1.16                24
 05/09/2021   06:58:23   ( -70.97,-106.90) 05/09/2021   06:57:36  ( -70.97,-106.96)    2.33                47
 05/11/2021   22:24:02   (  71.11,-158.52) 05/11/2021   22:24:32  (  71.13,-158.46)    2.71                30
 05/11/2021   23:14:43   ( -71.00,   8.99) 05/11/2021   23:14:02  ( -71.02,   9.00)    2.53                41
 05/14/2021   14:40:21   (  71.14, -42.64) 05/14/2021   14:40:58  (  71.12, -42.59)    2.92                37
 05/14/2021   15:31:02   ( -71.03, 124.88) 05/14/2021   15:30:28  ( -71.02, 124.88)    1.40                34