Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 8.  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)
 06/10/2021   10:14:23   ( -71.68,-156.87) 06/10/2021   10:15:32  ( -71.58,-155.30)   56.27                69
 06/10/2021   11:04:57   (  71.06,  11.54) 06/10/2021   11:05:07  (  71.05,  11.49)    2.00                10
 06/10/2021   11:55:38   ( -70.96, 179.03) 06/10/2021   11:54:36  ( -70.99, 179.02)    3.10                62
 06/13/2021   03:21:17   (  71.11, 127.38) 06/13/2021   03:21:36  (  71.11, 127.46)    2.70                19
 06/13/2021   04:11:58   ( -71.01, -65.12) 06/13/2021   04:11:06  ( -70.99, -65.09)    2.25                52
 06/15/2021   19:37:35   (  71.12,-116.69) 06/15/2021   19:38:05  (  71.11,-116.66)    1.69                30
 06/15/2021   20:28:16   ( -71.01,  50.82) 06/15/2021   20:27:35  ( -71.00,  50.79)    2.12                41
 06/18/2021   11:53:54   (  71.13,  -0.76) 06/18/2021   11:54:35  (  71.10,  -0.79)    3.28                41
 06/18/2021   12:44:35   ( -71.01, 166.76) 06/18/2021   12:44:04  ( -71.05, 166.76)    3.59                31
 06/21/2021   04:10:13   (  71.14, 115.17) 06/21/2021   04:11:04  (  71.15, 115.16)    0.88                51
 06/21/2021   05:00:54   ( -71.02, -77.31) 06/21/2021   05:00:34  ( -71.04, -77.37)    3.39                20