Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 11.  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)
 05/11/2021   22:24:00   (  71.04,-158.40) 05/11/2021   22:24:41  (  71.06,-158.45)    2.64                41
 05/11/2021   23:14:42   ( -70.99,   9.01) 05/11/2021   23:14:10  ( -71.00,   9.09)    3.07                32
 05/14/2021   14:40:20   (  71.08, -42.52) 05/14/2021   14:41:12  (  71.05, -42.58)    3.21                52
 05/14/2021   15:31:01   ( -70.97, 124.98) 05/14/2021   15:30:41  ( -71.00, 124.97)    2.68                20
 05/14/2021   16:21:29   (  70.03, -66.19) 05/14/2021   16:20:23  (  70.08, -68.76)   97.67                66
 05/17/2021   06:56:39   (  71.12,  73.35) 05/17/2021   06:57:41  (  71.10,  73.38)    1.75                62
 05/17/2021   07:47:20   ( -71.01,-119.15) 05/17/2021   07:47:11  ( -70.99,-119.16)    2.01                 9
 05/17/2021   08:37:55   (  70.44,  49.11) 05/17/2021   08:36:45  (  70.51,  47.74)   51.28                70
 05/19/2021   23:13:00   (  71.21,-170.87) 05/19/2021   23:14:11  (  71.15,-170.68)    9.95                71
 05/20/2021   00:03:40   ( -71.05,  -3.28) 05/20/2021   00:03:41  ( -71.04,  -3.21)    2.94                 1
 05/20/2021   00:54:22   (  70.85, 164.38) 05/20/2021   00:53:09  (  70.88, 164.19)    7.90                73
 05/22/2021   15:29:26   (  71.56, -55.56) 05/22/2021   15:30:36  (  71.46, -54.29)   46.36                70
 05/22/2021   16:19:59   ( -71.04, 112.67) 05/22/2021   16:20:12  ( -71.03, 112.65)    1.99                13
 05/22/2021   17:10:43   (  70.94, -79.85) 05/22/2021   17:09:39  (  70.92, -79.87)    2.82                64