Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 18.  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)
 05/19/2021   23:13:00   (  71.18,-170.81) 05/19/2021   23:14:11  (  71.16,-170.65)    5.96                71
 05/20/2021   00:03:40   ( -71.02,  -3.23) 05/20/2021   00:03:41  ( -71.05,  -3.20)    2.66                 1
 05/20/2021   00:54:22   (  70.81, 164.43) 05/20/2021   00:53:10  (  70.84, 164.12)   11.76                72
 05/22/2021   15:29:27   (  71.57, -55.58) 05/22/2021   15:30:36  (  71.47, -54.27)   47.51                69
 05/22/2021   16:20:00   ( -71.06, 112.65) 05/22/2021   16:20:12  ( -71.03, 112.66)    3.02                12
 05/22/2021   17:10:43   (  70.95, -79.86) 05/22/2021   17:09:38  (  70.93, -79.86)    2.31                65
 05/25/2021   07:45:53   (  71.97,  59.62) 05/25/2021   07:46:59  (  71.82,  62.20)   90.77                66
 05/25/2021   08:36:18   ( -71.04,-131.38) 05/25/2021   08:36:41  ( -71.07,-131.41)    2.98                23
 05/25/2021   09:27:02   (  70.94,  36.10) 05/25/2021   09:26:08  (  70.96,  36.07)    3.21                54
 05/28/2021   00:52:38   ( -71.08, -15.51) 05/28/2021   00:53:11  ( -71.10, -15.48)    2.42                33
 05/28/2021   01:43:22   (  70.98, 151.98) 05/28/2021   01:42:38  (  70.99, 152.00)    2.06                44
 05/30/2021   17:08:58   ( -71.11, 100.37) 05/30/2021   17:09:41  ( -71.12, 100.44)    2.62                43
 05/30/2021   17:59:42   (  71.01, -92.15) 05/30/2021   17:59:08  (  71.02, -92.09)    2.28                34