Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 29.  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)
 06/29/2021   04:59:16   (  71.53, 102.31) 06/29/2021   05:00:27  (  71.42, 103.25)   35.21                71
 06/29/2021   05:49:51   ( -71.10, -89.61) 06/29/2021   05:50:01  ( -71.08, -89.66)    2.46                10
 06/29/2021   06:40:35   (  71.01,  77.85) 06/29/2021   06:39:28  (  70.99,  77.84)    2.00                67
 07/01/2021   21:15:42   (  71.90,-142.44) 07/01/2021   21:16:49  (  71.82,-140.19)   78.37                67
 07/01/2021   22:06:10   ( -71.11,  26.31) 07/01/2021   22:06:30  ( -71.11,  26.27)    1.73                20
 07/01/2021   22:56:54   (  71.02,-166.23) 07/01/2021   22:55:57  (  71.02,-166.24)    0.91                57
 07/04/2021   14:22:29   ( -71.11, 142.24) 07/04/2021   14:22:59  ( -71.13, 142.19)    2.89                30
 07/04/2021   15:13:12   (  71.04, -50.32) 07/04/2021   15:12:25  (  71.04, -50.32)    0.46                47
 07/07/2021   06:38:48   ( -71.18,-101.92) 07/07/2021   06:39:27  ( -71.15,-101.90)    2.69                39
 07/07/2021   07:29:31   (  71.06,  65.60) 07/07/2021   07:28:54  (  71.05,  65.58)    0.70                37
 07/09/2021   22:55:07   ( -71.19,  14.00) 07/09/2021   22:55:56  ( -71.17,  14.01)    2.16                49
 07/09/2021   23:45:50   (  71.07,-178.49) 07/09/2021   23:45:23  (  71.06,-178.51)    1.56                27
 07/12/2021   15:11:26   ( -71.20, 129.92) 07/12/2021   15:12:25  ( -71.18, 129.91)    2.49                59
 07/12/2021   16:02:09   (  71.09, -62.58) 07/12/2021   16:01:52  (  71.07, -62.62)    3.02                17