Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 19.  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)
 09/20/2021   09:38:13   ( -71.33,-146.47) 09/20/2021   09:39:01  ( -71.33,-146.44)    1.06                48
 09/20/2021   10:28:57   (  71.23,  21.02) 09/20/2021   10:28:28  (  71.23,  21.05)    1.45                29
 09/23/2021   01:54:31   ( -71.34, -30.54) 09/23/2021   01:55:30  ( -71.35, -30.53)    0.94                59
 09/23/2021   02:45:15   (  71.24, 136.95) 09/23/2021   02:44:57  (  71.25, 136.96)    1.57                18
 09/23/2021   03:35:45   ( -70.56, -54.60) 09/23/2021   03:34:36  ( -70.65, -56.35)   65.29                69
 09/25/2021   18:10:48   ( -71.35,  85.39) 09/25/2021   18:11:58  ( -71.36,  85.38)    1.35                70
 09/25/2021   19:01:32   (  71.25,-107.13) 09/25/2021   19:01:25  (  71.26,-107.14)    1.54                 7
 09/25/2021   19:52:10   ( -70.99,  60.64) 09/25/2021   19:50:57  ( -71.04,  60.14)   18.71                73
 09/28/2021   10:27:12   ( -71.67,-159.25) 09/28/2021   10:28:23  ( -71.59,-158.36)   32.35                71
 09/28/2021   11:17:50   (  71.27,   8.79) 09/28/2021   11:17:54  (  71.27,   8.76)    1.45                 4
 09/28/2021   12:08:31   ( -71.16, 176.29) 09/28/2021   12:07:24  ( -71.16, 176.22)    2.81                67
 10/01/2021   02:43:38   ( -72.10, -44.10) 10/01/2021   02:44:45  ( -71.97, -41.83)   79.32                67
 10/01/2021   03:34:08   (  71.28, 124.71) 10/01/2021   03:34:23  (  71.28, 124.65)    2.18                15
 10/01/2021   04:24:50   ( -71.23, -67.88) 10/01/2021   04:23:52  ( -71.22, -67.80)    2.68                58