Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 9.  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   22:55:07   ( -71.18,  14.01) 07/09/2021   22:55:56  ( -71.18,  14.04)    1.00                49
 07/09/2021   23:45:50   (  71.06,-178.47) 07/09/2021   23:45:23  (  71.09,-178.47)    3.54                27
 07/12/2021   15:11:25   ( -71.20, 129.93) 07/12/2021   15:12:24  ( -71.20, 129.94)    0.53                59
 07/12/2021   16:02:08   (  71.08, -62.56) 07/12/2021   16:01:51  (  71.10, -62.57)    1.94                17
 07/12/2021   16:52:39   ( -70.42, 105.85) 07/12/2021   16:51:30  ( -70.50, 104.14)   64.37                69
 07/15/2021   07:27:44   ( -71.22,-114.16) 07/15/2021   07:28:53  ( -71.20,-114.16)    1.23                69
 07/15/2021   08:18:27   (  71.11,  53.34) 07/15/2021   08:18:20  (  71.10,  53.32)    0.87                 7
 07/15/2021   09:09:05   ( -70.80,-138.83) 07/15/2021   09:07:52  ( -70.88,-139.39)   22.32                73
 07/17/2021   23:44:08   ( -71.49,   1.29) 07/17/2021   23:45:19  ( -71.37,   1.99)   28.26                71
 07/18/2021   00:34:46   (  71.13, 169.24) 07/18/2021   00:34:48  (  71.16, 169.29)    3.34                 2
 07/18/2021   01:25:28   ( -71.03, -23.27) 07/18/2021   01:24:18  ( -71.05, -23.25)    2.27                70
 07/20/2021   16:00:33   ( -71.82, 116.63) 07/20/2021   16:01:41  ( -71.74, 118.50)   65.60                68
 07/20/2021   16:51:05   (  71.16, -74.86) 07/20/2021   16:51:17  (  71.15, -74.83)    1.15                12
 07/20/2021   17:41:47   ( -71.05,  92.64) 07/20/2021   17:40:47  ( -71.05,  92.64)    0.37                60