Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 8.  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)
 07/09/2021   22:55:06   ( -71.18,  14.01) 07/09/2021   22:55:55  ( -71.19,  14.05)    1.56                49
 07/09/2021   23:45:49   (  71.06,-178.46) 07/09/2021   23:45:23  (  71.04,-178.55)    3.55                26
 07/12/2021   15:11:25   ( -71.20, 129.92) 07/12/2021   15:12:24  ( -71.20, 129.95)    0.89                59
 07/12/2021   16:02:08   (  71.08, -62.56) 07/12/2021   16:01:51  (  71.10, -62.56)    2.06                17
 07/12/2021   16:52:39   ( -70.42, 105.85) 07/12/2021   16:51:30  ( -70.50, 104.14)   64.09                69
 07/15/2021   07:27:44   ( -71.22,-114.17) 07/15/2021   07:28:53  ( -71.21,-114.16)    1.37                69
 07/15/2021   08:18:27   (  71.11,  53.33) 07/15/2021   08:18:20  (  71.11,  53.32)    0.71                 7
 07/15/2021   09:09:05   ( -70.81,-138.84) 07/15/2021   09:07:52  ( -70.89,-139.38)   21.79                73
 07/17/2021   23:44:08   ( -71.50,   1.27) 07/17/2021   23:45:19  ( -71.37,   1.99)   29.29                71
 07/18/2021   00:34:46   (  71.14, 169.22) 07/18/2021   00:34:48  (  71.16, 169.29)    3.19                 2
 07/18/2021   01:25:28   ( -71.04, -23.29) 07/18/2021   01:24:18  ( -71.05, -23.24)    2.18                70
 07/20/2021   16:00:32   ( -71.84, 116.60) 07/20/2021   16:01:40  ( -71.75, 118.50)   66.90                68
 07/20/2021   16:51:04   (  71.17, -74.89) 07/20/2021   16:51:16  (  71.15, -74.83)    3.06                12
 07/20/2021   17:41:46   ( -71.07,  92.61) 07/20/2021   17:40:46  ( -71.05,  92.64)    2.09                60