Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 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)
 06/13/2021   03:21:17   (  71.10, 127.40) 06/13/2021   03:21:36  (  71.12, 127.48)    3.44                19
 06/13/2021   04:11:58   ( -71.00, -65.10) 06/13/2021   04:11:06  ( -71.00, -65.07)    1.12                52
 06/15/2021   19:37:35   (  71.11,-116.66) 06/15/2021   19:38:05  (  71.12,-116.64)    1.39                30
 06/15/2021   20:28:16   ( -71.00,  50.83) 06/15/2021   20:27:35  ( -71.00,  50.81)    0.97                41
 06/18/2021   11:53:54   (  71.12,  -0.74) 06/18/2021   11:54:35  (  71.11,  -0.77)    1.39                41
 06/18/2021   12:44:36   ( -71.06, 166.68) 06/18/2021   12:44:04  ( -71.05, 166.77)    3.12                32
 06/21/2021   04:10:13   (  71.13, 115.19) 06/21/2021   04:11:04  (  71.16, 115.18)    3.22                51
 06/21/2021   05:00:55   ( -71.06, -77.38) 06/21/2021   05:00:34  ( -71.05, -77.36)    1.88                21
 06/21/2021   05:51:22   (  70.08,  91.52) 06/21/2021   05:50:16  (  70.12,  88.89)   99.53                66
 06/23/2021   20:26:32   (  71.14,-128.89) 06/23/2021   20:27:34  (  71.14,-128.97)    2.59                62
 06/23/2021   21:17:13   ( -71.07,  38.55) 06/23/2021   21:17:02  ( -71.09,  38.59)    2.66                11