Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 15.  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)
 05/17/2021   06:56:39   (  71.10,  73.37) 05/17/2021   06:57:41  (  71.11,  73.39)    1.03                62
 05/17/2021   07:47:20   ( -71.01,-119.15) 05/17/2021   07:47:11  ( -71.00,-119.16)    1.79                 9
 05/17/2021   08:37:55   (  70.42,  49.13) 05/17/2021   08:36:45  (  70.52,  47.75)   52.01                70
 05/19/2021   23:13:00   (  71.20,-170.86) 05/19/2021   23:14:11  (  71.15,-170.67)    8.84                71
 05/20/2021   00:03:40   ( -71.06,  -3.29) 05/20/2021   00:03:41  ( -71.04,  -3.21)    3.48                 1
 05/20/2021   00:54:22   (  70.84, 164.39) 05/20/2021   00:53:09  (  70.89, 164.19)    8.79                73
 05/22/2021   15:29:26   (  71.57, -55.57) 05/22/2021   15:30:36  (  71.46, -54.29)   46.62                70
 05/22/2021   16:19:59   ( -71.06, 112.65) 05/22/2021   16:20:12  ( -71.03, 112.65)    3.55                13
 05/22/2021   17:10:43   (  70.95, -79.85) 05/22/2021   17:09:39  (  70.92, -79.87)    2.58                64
 05/25/2021   07:45:52   (  71.99,  59.59) 05/25/2021   07:46:58  (  71.87,  62.28)   93.78                66
 05/25/2021   08:36:17   ( -71.07,-131.42) 05/25/2021   08:36:41  ( -71.06,-131.42)    0.36                24
 05/25/2021   09:27:01   (  70.96,  36.08) 05/25/2021   09:26:08  (  70.96,  36.06)    0.58                53
 05/28/2021   00:52:36   ( -71.08, -15.50) 05/28/2021   00:53:11  ( -71.09, -15.49)    1.62                35
 05/28/2021   01:43:20   (  70.97, 151.99) 05/28/2021   01:42:38  (  70.99, 151.98)    1.60                42