Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 17.  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)
 09/17/2021   17:21:55   ( -71.30,  97.64) 09/17/2021   17:22:32  ( -71.32,  97.67)    2.85                37
 09/17/2021   18:12:39   (  71.20, -94.88) 09/17/2021   18:12:00  (  71.18, -94.92)    2.99                39
 09/20/2021   09:38:13   ( -71.30,-146.43) 09/20/2021   09:39:02  ( -71.29,-146.50)    2.94                49
 09/20/2021   10:28:57   (  71.20,  21.06) 09/20/2021   10:28:29  (  71.20,  20.99)    2.55                28
 09/23/2021   01:54:31   ( -71.36, -30.58) 09/23/2021   01:55:29  ( -71.36, -30.50)    2.92                58
 09/23/2021   02:45:15   (  71.26, 136.90) 09/23/2021   02:44:56  (  71.26, 136.99)    2.99                19
 09/23/2021   03:35:45   ( -70.59, -54.64) 09/23/2021   03:34:36  ( -70.61, -56.40)   65.31                69
 09/25/2021   18:10:49   ( -71.37,  85.35) 09/25/2021   18:11:58  ( -71.38,  85.40)    2.00                69
 09/25/2021   19:01:33   (  71.27,-107.17) 09/25/2021   19:01:25  (  71.28,-107.12)    1.85                 8
 09/25/2021   19:52:10   ( -70.96,  60.69) 09/25/2021   19:50:58  ( -71.00,  60.08)   22.62                72
 09/28/2021   10:27:13   ( -71.69,-159.28) 09/28/2021   10:28:24  ( -71.55,-158.43)   33.35                71
 09/28/2021   11:17:51   (  71.28,   8.76) 09/28/2021   11:17:54  (  71.28,   8.78)    0.45                 3
 09/28/2021   12:08:32   ( -71.18, 176.27) 09/28/2021   12:07:24  ( -71.17, 176.24)    1.23                68