Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 12.  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)
 09/12/2021   07:58:48   (  71.89,  57.34) 09/12/2021   07:59:57  (  71.78,  59.05)   60.45                69
 09/12/2021   08:49:19   ( -71.27,-134.21) 09/12/2021   08:49:34  ( -71.29,-134.14)    2.91                15
 09/12/2021   09:40:03   (  71.17,  33.27) 09/12/2021   09:39:01  (  71.19,  33.35)    3.62                62
 09/15/2021   01:05:37   ( -71.27, -18.26) 09/15/2021   01:06:04  ( -71.26, -18.30)    1.56                27
 09/15/2021   01:56:21   (  71.17, 149.22) 09/15/2021   01:55:31  (  71.17, 149.19)    1.20                50
 09/17/2021   17:21:55   ( -71.27,  97.68) 09/17/2021   17:22:33  ( -71.29,  97.62)    2.75                38
 09/17/2021   18:12:39   (  71.18, -94.84) 09/17/2021   18:12:00  (  71.19, -94.89)    2.45                39
 09/20/2021   09:38:13   ( -71.33,-146.47) 09/20/2021   09:39:01  ( -71.31,-146.46)    2.03                48
 09/20/2021   10:28:57   (  71.23,  21.01) 09/20/2021   10:28:28  (  71.21,  21.02)    2.61                29
 09/23/2021   01:54:31   ( -71.33, -30.53) 09/23/2021   01:55:30  ( -71.33, -30.56)    1.20                59
 09/23/2021   02:45:15   (  71.24, 136.94) 09/23/2021   02:44:57  (  71.22, 136.92)    1.97                18
 09/23/2021   03:35:45   ( -70.56, -54.59) 09/23/2021   03:34:36  ( -70.63, -56.37)   66.34                69
 09/25/2021   18:10:49   ( -71.34,  85.40) 09/25/2021   18:11:59  ( -71.34,  85.34)    2.28                70
 09/25/2021   19:01:33   (  71.24,-107.12) 09/25/2021   19:01:26  (  71.23,-107.19)    2.88                 7
 09/25/2021   19:52:10   ( -70.93,  60.74) 09/25/2021   19:50:58  ( -71.02,  60.11)   24.96                72