Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 7.  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)
 12/09/2021   12:56:08   ( -71.51, 164.38) 12/09/2021   12:56:48  ( -71.50, 164.36)    1.57                40
 12/09/2021   13:46:53   (  71.41, -28.13) 12/09/2021   13:46:15  (  71.40, -28.15)    1.28                38
 12/12/2021   04:23:19   (  71.47, 112.67) 12/12/2021   04:23:49  (  71.49, 112.59)    3.23                30
 12/12/2021   05:14:03   ( -71.44, -79.96) 12/12/2021   05:13:18  ( -71.43, -79.87)    3.28                45
 12/14/2021   19:50:28   ( -71.50,  60.85) 12/14/2021   19:50:51  ( -71.52,  60.87)    2.04                23
 12/14/2021   20:41:13   (  71.41,-131.68) 12/14/2021   20:40:18  (  71.41,-131.66)    1.00                55
 12/17/2021   10:27:07   ( -72.22,-159.60) 12/17/2021   10:28:15  ( -72.13,-157.47)   73.05                68
 12/17/2021   11:17:39   (  71.48,   9.11) 12/17/2021   11:17:52  (  71.49,   9.07)    1.60                13
 12/17/2021   12:08:22   ( -71.38, 176.60) 12/17/2021   12:07:22  ( -71.38, 176.53)    2.56                60
 12/20/2021   01:54:11   (  71.86, 149.33) 12/20/2021   01:55:22  (  71.77, 150.15)   30.11                71
 12/20/2021   02:44:49   ( -71.49, -42.69) 12/20/2021   02:44:55  ( -71.50, -42.66)    1.50                 6
 12/20/2021   03:35:34   (  71.42, 124.75) 12/20/2021   03:34:22  (  71.39, 124.80)    3.29                72