Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 30.  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)
 05/30/2021   17:08:57   ( -71.10, 100.40) 05/30/2021   17:09:41  ( -71.12, 100.43)    2.31                44
 05/30/2021   17:59:41   (  70.98, -92.09) 05/30/2021   17:59:09  (  70.97, -92.16)    2.72                32
 06/02/2021   09:25:16   ( -71.14,-143.74) 06/02/2021   09:26:10  ( -71.14,-143.66)    2.75                54
 06/02/2021   10:16:00   (  71.03,  23.77) 06/02/2021   10:15:37  (  71.04,  23.83)    2.83                23
 06/02/2021   11:06:27   ( -70.21,-167.57) 06/02/2021   11:05:19  ( -70.27,-169.70)   80.38                68
 06/05/2021   01:41:35   ( -71.13, -27.78) 06/05/2021   01:42:40  ( -71.15, -27.75)    2.40                65
 06/05/2021   02:32:19   (  71.03, 139.71) 06/05/2021   02:32:07  (  71.06, 139.73)    3.29                12
 06/05/2021   03:22:54   ( -70.62, -52.28) 06/05/2021   03:21:42  ( -70.67, -53.23)   35.21                72
 06/07/2021   17:57:57   ( -71.28,  87.90) 06/07/2021   17:59:09  ( -71.22,  88.23)   13.94                72
 06/07/2021   18:48:39   (  71.08,-104.44) 06/07/2021   18:48:37  (  71.06,-104.37)    2.79                 2
 06/07/2021   19:39:20   ( -70.98,  63.06) 06/07/2021   19:38:07  ( -70.96,  63.09)    2.61                73
 06/10/2021   10:14:24   ( -71.69,-156.90) 06/10/2021   10:15:33  ( -71.55,-155.35)   56.59                69
 06/10/2021   11:04:58   (  71.08,  11.50) 06/10/2021   11:05:07  (  71.07,  11.51)    1.24                 9
 06/10/2021   11:55:39   ( -70.97, 179.01) 06/10/2021   11:54:37  ( -70.96, 178.98)    1.45                62
 06/13/2021   02:30:49   ( -72.05, -41.63) 06/13/2021   02:31:55  ( -71.93, -38.82)   97.31                66