Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 17.  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)
 12/18/2020   02:37:37   (  71.53, 136.56) 12/18/2020   02:38:44  (  71.47, 138.82)   79.90                67
 12/18/2020   03:28:05   ( -70.72, -54.73) 12/18/2020   03:28:26  ( -70.70, -54.76)    2.19                21
 12/18/2020   04:18:48   (  70.59, 112.79) 12/18/2020   04:17:53  (  70.60, 112.73)    2.64                55
 12/20/2020   19:44:27   ( -70.75,  61.14) 12/20/2020   19:44:54  ( -70.74,  61.18)    2.27                27
 12/20/2020   20:35:10   (  70.62,-131.34) 12/20/2020   20:34:21  (  70.63,-131.34)    1.03                49
 12/23/2020   12:00:48   ( -70.74, 177.09) 12/23/2020   12:01:22  ( -70.77, 177.10)    3.24                34
 12/23/2020   12:51:32   (  70.66, -15.47) 12/23/2020   12:50:49  (  70.66, -15.42)    1.93                43
 12/26/2020   04:17:10   ( -70.78, -67.05) 12/26/2020   04:17:50  ( -70.79, -66.98)    2.92                40
 12/26/2020   05:07:53   (  70.64, 100.48) 12/26/2020   05:07:18  (  70.63, 100.41)    3.24                35
 12/28/2020   20:33:30   ( -70.76,  48.90) 12/28/2020   20:34:18  ( -70.75,  48.84)    2.27                48
 12/28/2020   21:24:14   (  70.68,-143.66) 12/28/2020   21:23:44  (  70.70,-143.60)    2.55                30