Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 6.  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)
 12/06/2021   21:28:59   (  71.53,-143.88) 12/06/2021   21:29:44  (  71.51,-143.85)    1.89                45
 12/06/2021   22:19:41   ( -71.41,  23.66) 12/06/2021   22:19:14  ( -71.40,  23.60)    2.34                27
 12/09/2021   12:56:08   ( -71.51, 164.38) 12/09/2021   12:56:48  ( -71.50, 164.36)    1.90                40
 12/09/2021   13:46:53   (  71.41, -28.13) 12/09/2021   13:46:15  (  71.40, -28.16)    1.81                38
 12/12/2021   04:23:19   (  71.47, 112.67) 12/12/2021   04:23:49  (  71.49, 112.58)    3.42                30
 12/12/2021   05:14:03   ( -71.44, -79.95) 12/12/2021   05:13:18  ( -71.43, -79.87)    2.94                45
 12/14/2021   19:50:28   ( -71.49,  60.86) 12/14/2021   19:50:51  ( -71.51,  60.87)    2.07                23
 12/14/2021   20:41:13   (  71.41,-131.68) 12/14/2021   20:40:18  (  71.41,-131.66)    0.45                55
 12/17/2021   10:27:07   ( -72.22,-159.58) 12/17/2021   10:28:15  ( -72.12,-157.48)   72.25                68
 12/17/2021   11:17:39   (  71.47,   9.12) 12/17/2021   11:17:52  (  71.48,   9.06)    2.36                13
 12/17/2021   12:08:23   ( -71.42, 176.52) 12/17/2021   12:07:21  ( -71.43, 176.61)    3.22                62
 12/20/2021   01:54:11   (  71.85, 149.35) 12/20/2021   01:55:22  (  71.76, 150.14)   29.01                71
 12/20/2021   02:44:49   ( -71.48, -42.67) 12/20/2021   02:44:55  ( -71.50, -42.67)    1.97                 6
 12/20/2021   03:35:34   (  71.41, 124.77) 12/20/2021   03:34:22  (  71.39, 124.79)    2.41                72