Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 12 23.  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)
 12/24/2019   22:24:54   ( -70.45,  20.55) 12/24/2019   22:25:36  ( -70.47,  20.61)    2.51                42
 12/24/2019   23:15:38   (  70.35,-171.97) 12/24/2019   23:15:03  (  70.36,-171.90)    2.81                35
 12/27/2019   14:41:19   ( -70.45, 136.46) 12/27/2019   14:42:05  ( -70.43, 136.44)    1.93                46
 12/27/2019   15:32:03   (  70.34, -56.06) 12/27/2019   15:31:32  (  70.32, -56.08)    2.27                31
 12/30/2019   06:57:43   ( -70.44,-107.63) 12/30/2019   06:58:32  ( -70.45,-107.66)    1.26                49
 12/30/2019   07:48:27   (  70.33,  59.85) 12/30/2019   07:47:59  (  70.33,  59.82)    1.08                28
 01/01/2020   23:14:08   ( -70.44,   8.27) 01/01/2020   23:15:00  ( -70.46,   8.24)    2.61                52
 01/02/2020   00:04:52   (  70.33, 175.75) 01/02/2020   00:04:27  (  70.34, 175.71)    1.97                25
 01/02/2020   00:55:18   ( -69.43, -15.58) 01/02/2020   00:54:11  ( -69.47, -17.87)   89.54                67
 01/04/2020   15:30:34   ( -70.49, 124.09) 01/04/2020   15:31:28  ( -70.46, 124.13)    3.06                54
 01/04/2020   16:21:17   (  70.33, -68.35) 01/04/2020   16:20:55  (  70.34, -68.40)    2.77                22