Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 13.  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)
 09/15/2021   01:05:37   ( -71.27, -18.26) 09/15/2021   01:06:04  ( -71.27, -18.29)    1.33                27
 09/15/2021   01:56:21   (  71.17, 149.22) 09/15/2021   01:55:31  (  71.18, 149.20)    1.14                50
 09/17/2021   17:21:55   ( -71.32,  97.59) 09/17/2021   17:22:32  ( -71.30,  97.64)    3.16                37
 09/17/2021   18:12:38   (  71.17, -94.84) 09/17/2021   18:11:59  (  71.20, -94.88)    3.28                39
 09/20/2021   09:38:13   ( -71.33,-146.47) 09/20/2021   09:39:01  ( -71.32,-146.45)    1.39                48
 09/20/2021   10:28:57   (  71.23,  21.01) 09/20/2021   10:28:28  (  71.22,  21.03)    1.79                29
 09/23/2021   01:54:31   ( -71.34, -30.54) 09/23/2021   01:55:30  ( -71.34, -30.54)    0.16                59
 09/23/2021   02:45:15   (  71.24, 136.94) 09/23/2021   02:44:57  (  71.24, 136.94)    0.85                18
 09/23/2021   03:35:45   ( -70.56, -54.60) 09/23/2021   03:34:36  ( -70.64, -56.36)   65.43                69
 09/25/2021   18:10:49   ( -71.35,  85.39) 09/25/2021   18:11:59  ( -71.35,  85.36)    0.80                70
 09/25/2021   19:01:33   (  71.25,-107.14) 09/25/2021   19:01:26  (  71.25,-107.16)    1.31                 7
 09/25/2021   19:52:11   ( -70.99,  60.64) 09/25/2021   19:50:58  ( -71.03,  60.13)   18.88                73