Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 26.  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)
 06/26/2021   12:42:51   (  71.20, -13.05) 06/26/2021   12:44:02  (  71.18, -13.02)    2.08                71
 06/26/2021   13:33:32   ( -71.08, 154.47) 06/26/2021   13:33:32  ( -71.06, 154.42)    3.04                 0
 06/26/2021   14:24:13   (  70.83, -37.80) 06/26/2021   14:23:00  (  70.91, -38.16)   15.77                73
 06/29/2021   04:59:16   (  71.52, 102.32) 06/29/2021   05:00:27  (  71.43, 103.26)   35.10                71
 06/29/2021   05:49:51   ( -71.09, -89.60) 06/29/2021   05:50:01  ( -71.09, -89.64)    1.62                10
 06/29/2021   06:40:35   (  71.01,  77.85) 06/29/2021   06:39:28  (  71.00,  77.85)    0.97                67
 07/01/2021   21:15:42   (  71.90,-142.44) 07/01/2021   21:16:49  (  71.83,-140.18)   78.66                67
 07/01/2021   22:06:10   ( -71.10,  26.33) 07/01/2021   22:06:30  ( -71.12,  26.29)    3.06                20
 07/01/2021   22:56:54   (  71.02,-166.23) 07/01/2021   22:55:57  (  71.02,-166.23)    0.30                57
 07/04/2021   14:22:29   ( -71.16, 142.16) 07/04/2021   14:22:58  ( -71.15, 142.21)    2.24                29
 07/04/2021   15:13:12   (  71.04, -50.32) 07/04/2021   15:12:25  (  71.04, -50.31)    0.67                47
 07/07/2021   06:38:48   ( -71.17,-101.92) 07/07/2021   06:39:27  ( -71.17,-101.88)    1.59                39
 07/07/2021   07:29:31   (  71.06,  65.59) 07/07/2021   07:28:54  (  71.06,  65.60)    0.57                37
 07/09/2021   22:55:07   ( -71.19,  14.00) 07/09/2021   22:55:56  ( -71.18,  14.03)    1.19                49
 07/09/2021   23:45:50   (  71.08,-178.50) 07/09/2021   23:45:23  (  71.07,-178.49)    0.43                27