Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 27.  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)
 05/28/2021   00:52:37   ( -71.08, -15.51) 05/28/2021   00:53:11  ( -71.07, -15.53)    1.87                34
 05/28/2021   01:43:21   (  70.96, 152.00) 05/28/2021   01:42:38  (  70.97, 151.97)    1.72                43
 05/30/2021   17:08:56   ( -71.07, 100.45) 05/30/2021   17:09:41  ( -71.09, 100.39)    3.12                45
 05/30/2021   17:59:41   (  71.01, -92.14) 05/30/2021   17:59:08  (  71.00, -92.12)    1.50                33
 06/02/2021   09:25:16   ( -71.11,-143.69) 06/02/2021   09:26:11  ( -71.11,-143.70)    0.68                55
 06/02/2021   10:16:00   (  71.00,  23.81) 06/02/2021   10:15:38  (  71.01,  23.79)    1.47                22
 06/02/2021   11:06:27   ( -70.18,-167.52) 06/02/2021   11:05:20  ( -70.25,-169.74)   83.69                67
 06/05/2021   01:41:35   ( -71.11, -27.73) 06/05/2021   01:42:41  ( -71.13, -27.80)    3.32                66
 06/05/2021   02:32:20   (  71.05, 139.67) 06/05/2021   02:32:08  (  71.02, 139.68)    2.99                12
 06/05/2021   03:22:54   ( -70.59, -52.24) 06/05/2021   03:21:43  ( -70.64, -53.27)   38.64                71
 06/07/2021   17:57:57   ( -71.31,  87.86) 06/07/2021   17:59:08  ( -71.24,  88.27)   16.13                71
 06/07/2021   18:48:38   (  71.05,-104.38) 06/07/2021   18:48:37  (  71.03,-104.43)    2.40                 1
 06/07/2021   19:39:19   ( -70.95,  63.11) 06/07/2021   19:38:07  ( -70.92,  63.04)    3.45                72
 06/10/2021   10:14:23   ( -71.66,-156.84) 06/10/2021   10:15:32  ( -71.57,-155.31)   54.37                69
 06/10/2021   11:04:58   (  71.10,  11.47) 06/10/2021   11:05:06  (  71.09,  11.54)    3.05                 8
 06/10/2021   11:55:39   ( -70.99, 178.97) 06/10/2021   11:54:36  ( -70.98, 179.01)    1.72                63