Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 1 18.  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)
 01/20/2020   17:09:05   ( -70.59,  99.32) 01/20/2020   17:10:17  ( -70.54,  99.51)    8.56                72
 01/20/2020   17:59:47   (  70.36, -93.01) 01/20/2020   17:59:45  (  70.38, -93.09)    3.40                 2
 01/20/2020   18:50:28   ( -70.27,  74.46) 01/20/2020   18:49:15  ( -70.27,  74.39)    2.69                73
 01/23/2020   09:25:31   ( -70.69,-144.95) 01/23/2020   09:26:43  ( -70.61,-144.51)   18.50                72
 01/23/2020   10:16:12   (  70.42,  22.80) 01/23/2020   10:16:12  (  70.39,  22.81)    2.98                 0
 01/23/2020   11:06:52   ( -70.27,-169.64) 01/23/2020   11:05:42  ( -70.29,-169.71)    3.36                70
 01/26/2020   01:41:58   ( -70.80, -29.22) 01/26/2020   01:43:10  ( -70.68, -28.52)   28.72                72
 01/26/2020   02:32:37   (  70.42, 138.69) 01/26/2020   02:32:40  (  70.40, 138.71)    2.55                 3
 01/26/2020   03:23:18   ( -70.32, -53.82) 01/26/2020   03:22:10  ( -70.30, -53.81)    2.36                68
 01/28/2020   17:58:25   ( -70.90,  86.50) 01/28/2020   17:59:36  ( -70.80,  87.53)   39.53                71
 01/28/2020   18:49:02   (  70.43,-105.42) 01/28/2020   18:49:08  (  70.41,-105.40)    2.74                 6
 01/28/2020   19:39:43   ( -70.32,  62.07) 01/28/2020   19:38:38  ( -70.31,  62.09)    1.76                65
 01/31/2020   10:14:52   ( -71.01,-157.78) 01/31/2020   10:16:02  ( -70.91,-156.41)   50.94                70
 01/31/2020   11:05:26   (  70.39,  10.55) 01/31/2020   11:05:36  (  70.41,  10.48)    3.41                10
 01/31/2020   11:56:08   ( -70.33, 177.97) 01/31/2020   11:55:06  ( -70.31, 177.97)    1.76                62