Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 22.  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)
 09/23/2021   01:54:30   ( -71.32, -30.51) 09/23/2021   01:55:30  ( -71.31, -30.60)    3.61                60
 09/23/2021   02:45:14   (  71.22, 136.98) 09/23/2021   02:44:57  (  71.21, 136.90)    3.00                17
 09/23/2021   03:35:44   ( -70.55, -54.57) 09/23/2021   03:34:36  ( -70.60, -56.41)   68.27                68
 09/25/2021   18:10:49   ( -71.38,  85.33) 09/25/2021   18:11:58  ( -71.37,  85.39)    2.74                69
 09/25/2021   19:01:33   (  71.28,-107.18) 09/25/2021   19:01:25  (  71.28,-107.12)    2.26                 8
 09/25/2021   19:52:10   ( -70.97,  60.67) 09/25/2021   19:50:57  ( -71.05,  60.16)   20.37                73
 09/28/2021   10:27:12   ( -71.65,-159.21) 09/28/2021   10:28:24  ( -71.54,-158.45)   29.50                72
 09/28/2021   11:17:51   (  71.29,   8.75) 09/28/2021   11:17:54  (  71.28,   8.77)    1.41                 3
 09/28/2021   12:08:32   ( -71.19, 176.24) 09/28/2021   12:07:24  ( -71.17, 176.22)    2.79                68
 10/01/2021   02:43:38   ( -72.07, -44.05) 10/01/2021   02:44:45  ( -71.97, -41.83)   77.20                67
 10/01/2021   03:34:09   (  71.30, 124.67) 10/01/2021   03:34:23  (  71.28, 124.65)    2.79                14
 10/01/2021   04:24:50   ( -71.20, -67.83) 10/01/2021   04:23:52  ( -71.22, -67.80)    2.39                58
 10/03/2021   19:50:26   (  71.32,-119.41) 10/03/2021   19:50:50  (  71.33,-119.39)    1.19                24
 10/03/2021   20:41:07   ( -71.22,  48.09) 10/03/2021   20:40:20  ( -71.22,  48.07)    0.89                47