Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 9.  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)
 12/12/2021   04:23:19   (  71.52, 112.59) 12/12/2021   04:23:48  (  71.51, 112.62)    2.06                29
 12/12/2021   05:14:01   ( -71.39, -79.86) 12/12/2021   05:13:18  ( -71.39, -79.94)    2.85                43
 12/14/2021   19:50:28   ( -71.50,  60.85) 12/14/2021   19:50:52  ( -71.48,  60.81)    2.74                24
 12/14/2021   20:41:13   (  71.41,-131.68) 12/14/2021   20:40:18  (  71.43,-131.62)    3.15                55
 12/17/2021   10:27:08   ( -72.29,-159.72) 12/17/2021   10:28:15  ( -72.15,-157.43)   78.89                67
 12/17/2021   11:17:39   (  71.49,   9.10) 12/17/2021   11:17:52  (  71.51,   9.11)    2.93                13
 12/17/2021   12:08:22   ( -71.39, 176.59) 12/17/2021   12:07:22  ( -71.41, 176.57)    1.95                60
 12/20/2021   01:54:12   (  71.93, 149.20) 12/20/2021   01:55:22  (  71.81, 150.21)   37.42                70
 12/20/2021   02:44:49   ( -71.51, -42.72) 12/20/2021   02:44:56  ( -71.48, -42.70)    3.17                 7
 12/20/2021   03:35:33   (  71.39, 124.81) 12/20/2021   03:34:23  (  71.38, 124.77)    1.87                70
 12/22/2021   17:21:16   ( -71.69,  97.87) 12/22/2021   17:22:27  ( -71.66,  98.20)   11.90                71
 12/22/2021   18:11:59   (  71.52, -94.51) 12/22/2021   18:11:55  (  71.50, -94.42)    3.71                 4
 12/22/2021   19:02:39   ( -71.25,  73.28) 12/22/2021   19:01:27  ( -71.29,  72.87)   15.37                72