Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 11 21.  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)
 11/23/2021   16:13:26   ( -71.54, 114.92) 11/23/2021   16:14:33  ( -71.54, 115.00)    3.06                67
 11/23/2021   17:04:11   (  71.40, -77.52) 11/23/2021   17:04:01  (  71.39, -77.60)    2.88                10
 11/23/2021   17:54:47   ( -70.96,  90.54) 11/23/2021   17:53:36  ( -71.01,  89.42)   40.91                71
 11/26/2021   07:41:05   (  71.47,  63.13) 11/26/2021   07:41:35  (  71.47,  63.12)    0.46                30
 11/26/2021   08:31:48   ( -71.39,-129.40) 11/26/2021   08:31:05  ( -71.36,-129.42)    3.26                43
 11/28/2021   22:18:12   (  71.54,-156.24) 11/28/2021   22:19:10  (  71.54,-156.15)    3.18                58
 11/28/2021   23:08:55   ( -71.44,  11.25) 11/28/2021   23:08:40  ( -71.44,  11.30)    1.97                15
 11/28/2021   23:59:27   (  70.61, 179.96) 11/28/2021   23:58:20  (  70.62, 177.67)   84.57                67
 12/01/2021   12:55:33   (  71.69, -15.84) 12/01/2021   12:56:45  (  71.61, -15.44)   16.78                72
 12/01/2021   13:46:13   ( -71.43, 151.96) 12/01/2021   13:46:16  ( -71.45, 151.93)    3.38                 3
 12/01/2021   14:36:57   (  71.22, -40.38) 12/01/2021   14:35:44  (  71.29, -40.69)   13.33                73
 12/04/2021   03:33:07   (  71.89, 124.43) 12/04/2021   03:34:18  (  71.78, 125.45)   37.63                71
 12/04/2021   04:23:44   ( -71.46, -67.46) 12/04/2021   04:23:52  ( -71.47, -67.45)    1.40                 8
 12/04/2021   05:14:30   (  71.36, 100.02) 12/04/2021   05:13:19  (  71.36, 100.02)    0.21                71