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)
 12/09/2021   12:56:08   ( -71.53, 164.35) 12/09/2021   12:56:47  ( -71.54, 164.43)    3.00                39
 12/09/2021   13:46:53   (  71.42, -28.16) 12/09/2021   13:46:14  (  71.44, -28.09)    3.35                39
 12/12/2021   04:23:19   (  71.49, 112.64) 12/12/2021   04:23:49  (  71.48, 112.58)    2.49                30
 12/12/2021   05:14:02   ( -71.41, -79.90) 12/12/2021   05:13:18  ( -71.42, -79.89)    1.58                44
 12/14/2021   19:50:29   ( -71.52,  60.81) 12/14/2021   19:50:52  ( -71.51,  60.86)    2.36                23
 12/14/2021   20:41:13   (  71.38,-131.63) 12/14/2021   20:40:19  (  71.41,-131.66)    2.92                54
 12/17/2021   10:27:07   ( -72.26,-159.66) 12/17/2021   10:28:14  ( -72.18,-157.38)   77.74                67
 12/17/2021   11:17:39   (  71.51,   9.06) 12/17/2021   11:17:52  (  71.49,   9.07)    2.46                13
 12/17/2021   12:08:22   ( -71.41, 176.55) 12/17/2021   12:07:22  ( -71.38, 176.53)    3.26                60
 12/20/2021   01:54:11   (  71.90, 149.26) 12/20/2021   01:55:22  (  71.78, 150.16)   33.99                71
 12/20/2021   02:44:48   ( -71.48, -42.66) 12/20/2021   02:44:56  ( -71.46, -42.74)    3.64                 8
 12/20/2021   03:35:33   (  71.41, 124.78) 12/20/2021   03:34:22  (  71.41, 124.82)    1.41                71
 12/22/2021   17:21:16   ( -71.66,  97.93) 12/22/2021   17:22:28  ( -71.64,  98.16)    8.19                72
 12/22/2021   18:11:59   (  71.49, -94.45) 12/22/2021   18:11:56  (  71.48, -94.47)    1.38                 3
 12/22/2021   19:02:40   ( -71.27,  73.25) 12/22/2021   19:01:27  ( -71.32,  72.91)   13.13                73