Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 8.  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)    3.16                39
 12/09/2021   13:46:53   (  71.42, -28.15) 12/09/2021   13:46:14  (  71.44, -28.08)    3.43                39
 12/12/2021   04:23:19   (  71.49, 112.64) 12/12/2021   04:23:49  (  71.48, 112.58)    2.54                30
 12/12/2021   05:14:02   ( -71.41, -79.89) 12/12/2021   05:13:18  ( -71.42, -79.89)    1.96                44
 12/14/2021   19:50:29   ( -71.52,  60.82) 12/14/2021   19:50:52  ( -71.51,  60.86)    1.78                23
 12/14/2021   20:41:13   (  71.43,-131.72) 12/14/2021   20:40:18  (  71.41,-131.67)    3.28                55
 12/17/2021   10:27:07   ( -72.25,-159.64) 12/17/2021   10:28:15  ( -72.13,-157.48)   74.74                68
 12/17/2021   11:17:39   (  71.50,   9.07) 12/17/2021   11:17:52  (  71.48,   9.06)    2.03                13
 12/17/2021   12:08:22   ( -71.40, 176.56) 12/17/2021   12:07:22  ( -71.38, 176.52)    2.97                60
 12/20/2021   01:54:11   (  71.89, 149.28) 12/20/2021   01:55:22  (  71.77, 150.15)   32.82                71
 12/20/2021   02:44:49   ( -71.52, -42.74) 12/20/2021   02:44:55  ( -71.51, -42.66)    2.99                 6
 12/20/2021   03:35:33   (  71.40, 124.80) 12/20/2021   03:34:22  (  71.40, 124.80)    0.41                71