Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 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)
 08/03/2021   02:12:38   (  71.27, 144.66) 08/03/2021   02:13:49  (  71.25, 144.70)    2.60                71
 08/03/2021   03:03:19   ( -71.12, -47.76) 08/03/2021   03:03:19  ( -71.14, -47.84)    3.56                 0
 08/03/2021   03:54:00   (  70.91, 119.91) 08/03/2021   03:52:47  (  70.99, 119.56)   15.33                73
 08/05/2021   18:29:04   (  71.66,-100.10) 08/05/2021   18:30:14  (  71.53, -98.96)   42.74                70
 08/05/2021   19:19:38   ( -71.15,  68.13) 08/05/2021   19:19:49  ( -71.16,  68.06)    2.62                11
 08/05/2021   20:10:21   (  71.05,-124.37) 08/05/2021   20:09:16  (  71.05,-124.46)    3.10                65
 08/08/2021   10:45:29   (  72.06,  15.11) 08/08/2021   10:46:35  (  71.97,  17.67)   88.60                66
 08/08/2021   11:35:56   ( -71.18,-175.98) 08/08/2021   11:36:18  ( -71.17,-176.04)    2.82                22
 08/08/2021   12:26:39   (  71.08,  -8.49) 08/08/2021   12:25:45  (  71.06,  -8.57)    3.63                54
 08/11/2021   03:52:15   ( -71.21, -60.09) 08/11/2021   03:52:47  ( -71.23, -60.06)    1.92                32
 08/11/2021   04:42:58   (  71.11, 107.40) 08/11/2021   04:42:14  (  71.12, 107.40)    0.66                44
 08/13/2021   20:08:34   ( -71.25,  55.80) 08/13/2021   20:09:17  ( -71.23,  55.82)    1.87                43
 08/13/2021   20:59:17   (  71.15,-136.72) 08/13/2021   20:58:44  (  71.12,-136.71)    3.12                33