Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 14.  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)
 07/15/2021   07:27:44   ( -71.20,-114.14) 07/15/2021   07:28:53  ( -71.22,-114.15)    1.53                69
 07/15/2021   08:18:28   (  71.14,  53.29) 07/15/2021   08:18:20  (  71.12,  53.35)    2.92                 8
 07/15/2021   09:09:05   ( -70.79,-138.81) 07/15/2021   09:07:53  ( -70.84,-139.46)   24.46                72
 07/17/2021   23:44:08   ( -71.48,   1.32) 07/17/2021   23:45:19  ( -71.38,   2.01)   26.59                71
 07/18/2021   00:34:45   (  71.11, 169.28) 07/18/2021   00:34:48  (  71.12, 169.23)    2.17                 3
 07/18/2021   01:25:27   ( -71.01, -23.24) 07/18/2021   01:24:18  ( -71.01, -23.31)    2.67                69
 07/20/2021   16:00:32   ( -71.80, 116.66) 07/20/2021   16:01:41  ( -71.71, 118.43)   62.52                69
 07/20/2021   16:51:04   (  71.13, -74.82) 07/20/2021   16:51:17  (  71.12, -74.89)    2.93                13
 07/20/2021   17:41:46   ( -71.03,  92.67) 07/20/2021   17:40:46  ( -71.06,  92.66)    3.33                60
 07/23/2021   09:07:23   (  71.16,  41.08) 07/23/2021   09:07:45  (  71.17,  41.07)    0.97                22
 07/23/2021   09:58:05   ( -71.05,-151.42) 07/23/2021   09:57:15  ( -71.06,-151.46)    1.63                50
 07/26/2021   01:23:42   (  71.18, 156.98) 07/26/2021   01:24:14  (  71.16, 156.94)    3.34                32
 07/26/2021   02:14:24   ( -71.07, -35.52) 07/26/2021   02:13:44  ( -71.05, -35.59)    3.49                40
 07/28/2021   17:40:00   (  71.21, -87.12) 07/28/2021   17:40:41  (  71.20, -87.11)    1.58                41