Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 19.  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)
 12/20/2020   19:44:27   ( -70.75,  61.14) 12/20/2020   19:44:54  ( -70.74,  61.18)    2.11                27
 12/20/2020   20:35:10   (  70.62,-131.33) 12/20/2020   20:34:21  (  70.64,-131.33)    1.98                49
 12/23/2020   12:00:48   ( -70.74, 177.09) 12/23/2020   12:01:23  ( -70.72, 177.02)    3.47                35
 12/23/2020   12:51:32   (  70.66, -15.47) 12/23/2020   12:50:49  (  70.67, -15.41)    2.35                43
 12/26/2020   04:17:10   ( -70.78, -67.05) 12/26/2020   04:17:50  ( -70.80, -66.98)    3.32                40
 12/26/2020   05:07:53   (  70.65, 100.48) 12/26/2020   05:07:18  (  70.63, 100.42)    2.55                35
 12/28/2020   20:33:30   ( -70.77,  48.89) 12/28/2020   20:34:18  ( -70.76,  48.85)    1.82                48
 12/28/2020   21:24:14   (  70.69,-143.66) 12/28/2020   21:23:44  (  70.70,-143.59)    3.22                30
 12/31/2020   12:49:51   ( -70.76, 164.83) 12/31/2020   12:50:46  ( -70.77, 164.75)    3.26                55
 12/31/2020   13:40:35   (  70.67, -27.72) 12/31/2020   13:40:13  (  70.66, -27.78)    2.85                22