Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 31.  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)
 07/31/2021   09:56:19   (  71.21,  28.83) 07/31/2021   09:57:20  (  71.22,  28.77)    2.51                61
 07/31/2021   10:47:01   ( -71.16,-163.78) 07/31/2021   10:46:48  ( -71.16,-163.69)    3.13                13
 07/31/2021   11:37:33   (  70.48,   4.68) 07/31/2021   11:36:24  (  70.57,   3.04)   61.45                69
 08/03/2021   02:12:37   (  71.24, 144.72) 08/03/2021   02:13:49  (  71.23, 144.67)    1.85                72
 08/03/2021   03:03:19   ( -71.14, -47.79) 08/03/2021   03:03:19  ( -71.12, -47.87)    3.34                 0
 08/03/2021   03:54:00   (  70.93, 119.88) 08/03/2021   03:52:47  (  70.97, 119.53)   13.57                73
 08/05/2021   18:29:03   (  71.63,-100.04) 08/05/2021   18:30:13  (  71.57, -98.90)   40.48                70
 08/05/2021   19:19:38   ( -71.17,  68.11) 08/05/2021   19:19:48  ( -71.19,  68.12)    2.79                10
 08/05/2021   20:10:21   (  71.06,-124.40) 08/05/2021   20:09:15  (  71.09,-124.41)    2.57                66
 08/08/2021   10:45:30   (  72.07,  15.08) 08/08/2021   10:46:36  (  71.95,  17.63)   88.85                66
 08/08/2021   11:35:57   ( -71.20,-176.00) 08/08/2021   11:36:18  ( -71.20,-175.99)    0.72                21
 08/08/2021   12:26:40   (  71.09,  -8.51) 08/08/2021   12:25:45  (  71.09,  -8.52)    0.29                55
 08/11/2021   03:52:15   ( -71.23, -60.11) 08/11/2021   03:52:47  ( -71.21, -60.10)    2.36                32
 08/11/2021   04:42:58   (  71.13, 107.37) 08/11/2021   04:42:14  (  71.09, 107.37)    3.65                44
 08/13/2021   20:08:33   ( -71.21,  55.86) 08/13/2021   20:09:17  ( -71.21,  55.78)    3.04                44
 08/13/2021   20:59:17   (  71.16,-136.74) 08/13/2021   20:58:43  (  71.15,-136.67)    2.90                34