Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 6.  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)
 06/07/2021   17:57:57   ( -71.30,  87.88) 06/07/2021   17:59:09  ( -71.22,  88.23)   15.29                72
 06/07/2021   18:48:39   (  71.08,-104.44) 06/07/2021   18:48:37  (  71.07,-104.36)    3.31                 2
 06/07/2021   19:39:19   ( -70.94,  63.13) 06/07/2021   19:38:07  ( -70.95,  63.09)    2.38                72
 06/10/2021   10:14:23   ( -71.66,-156.83) 06/10/2021   10:15:33  ( -71.55,-155.35)   53.52                70
 06/10/2021   11:04:58   (  71.09,  11.49) 06/10/2021   11:05:07  (  71.08,  11.53)    2.05                 9
 06/10/2021   11:55:38   ( -70.99, 178.98) 06/10/2021   11:54:36  ( -70.96, 178.98)    2.97                62
 06/13/2021   03:21:16   (  71.10, 127.41) 06/13/2021   03:21:36  (  71.08, 127.41)    2.09                20
 06/13/2021   04:11:57   ( -70.99, -65.09) 06/13/2021   04:11:06  ( -70.97, -65.13)    3.17                51
 06/15/2021   19:37:35   (  71.11,-116.67) 06/15/2021   19:38:05  (  71.13,-116.62)    2.97                30
 06/15/2021   20:28:16   ( -71.00,  50.84) 06/15/2021   20:27:35  ( -71.02,  50.84)    2.65                41
 06/18/2021   11:53:54   (  71.13,  -0.75) 06/18/2021   11:54:35  (  71.13,  -0.75)    0.24                41
 06/18/2021   12:44:35   ( -71.01, 166.77) 06/18/2021   12:44:05  ( -71.02, 166.72)    2.24                30