Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 30.  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)
 07/01/2021   21:15:42   (  71.89,-142.42) 07/01/2021   21:16:49  (  71.83,-140.17)   78.01                67
 07/01/2021   22:06:10   ( -71.10,  26.33) 07/01/2021   22:06:30  ( -71.12,  26.28)    3.09                20
 07/01/2021   22:56:54   (  71.01,-166.21) 07/01/2021   22:55:57  (  71.03,-166.22)    1.64                57
 07/04/2021   14:22:29   ( -71.16, 142.17) 07/04/2021   14:22:58  ( -71.14, 142.20)    1.76                29
 07/04/2021   15:13:12   (  71.03, -50.30) 07/04/2021   15:12:25  (  71.05, -50.31)    2.29                47
 07/07/2021   06:38:48   ( -71.16,-101.90) 07/07/2021   06:39:27  ( -71.16,-101.88)    0.64                39
 07/07/2021   07:29:31   (  71.04,  65.62) 07/07/2021   07:28:54  (  71.06,  65.60)    2.44                37
 07/09/2021   22:55:07   ( -71.17,  14.03) 07/09/2021   22:55:56  ( -71.18,  14.02)    0.63                49
 07/09/2021   23:45:50   (  71.06,-178.46) 07/09/2021   23:45:23  (  71.07,-178.50)    2.24                27
 07/12/2021   15:11:26   ( -71.18, 129.95) 07/12/2021   15:12:25  ( -71.19, 129.92)    1.25                59
 07/12/2021   16:02:09   (  71.07, -62.55) 07/12/2021   16:01:52  (  71.08, -62.60)    2.24                17