Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 3.  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)
 12/04/2021   06:01:47   ( -71.52, -92.07) 12/04/2021   06:02:43  ( -71.53, -92.07)    1.75                56
 12/04/2021   06:52:33   (  71.45,  75.35) 12/04/2021   06:52:10  (  71.43,  75.42)    3.07                23
 12/04/2021   07:43:00   ( -70.56,-115.81) 12/04/2021   07:41:53  ( -70.61,-118.23)   89.96                67
 12/06/2021   21:28:59   (  71.52,-143.85) 12/06/2021   21:29:44  (  71.54,-143.81)    2.53                45
 12/06/2021   22:19:42   ( -71.45,  23.59) 12/06/2021   22:19:14  ( -71.42,  23.64)    2.86                28
 12/09/2021   12:56:07   ( -71.51, 164.39) 12/09/2021   12:56:47  ( -71.52, 164.40)    1.59                40
 12/09/2021   13:46:52   (  71.41, -28.12) 12/09/2021   13:46:14  (  71.42, -28.12)    1.16                38
 12/12/2021   04:23:18   (  71.48, 112.66) 12/12/2021   04:23:48  (  71.51, 112.62)    2.81                30
 12/12/2021   05:14:01   ( -71.40, -79.87) 12/12/2021   05:13:18  ( -71.40, -79.92)    1.72                43
 12/14/2021   19:50:27   ( -71.47,  60.91) 12/14/2021   19:50:52  ( -71.49,  60.82)    3.81                25
 12/14/2021   20:41:12   (  71.38,-131.63) 12/14/2021   20:40:19  (  71.38,-131.71)    3.11                53