Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 1 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)
 01/20/2020   17:09:05   ( -70.62,  99.28) 01/20/2020   17:10:16  ( -70.56,  99.54)   11.35                71
 01/20/2020   17:59:47   (  70.39, -93.05) 01/20/2020   17:59:44  (  70.40, -93.05)    1.32                 3
 01/20/2020   18:50:27   ( -70.24,  74.50) 01/20/2020   18:49:15  ( -70.24,  74.34)    5.88                72
 01/23/2020   09:25:32   ( -70.72,-144.99) 01/23/2020   09:26:43  ( -70.63,-144.47)   21.31                71
 01/23/2020   10:16:12   (  70.39,  22.84) 01/23/2020   10:16:12  (  70.42,  22.85)    2.52                 0
 01/23/2020   11:06:53   ( -70.29,-169.68) 01/23/2020   11:05:42  ( -70.31,-169.67)    1.68                71
 01/26/2020   01:41:59   ( -70.82, -29.26) 01/26/2020   01:43:10  ( -70.70, -28.49)   31.43                71
 01/26/2020   02:32:37   (  70.40, 138.73) 01/26/2020   02:32:40  (  70.43, 138.74)    3.06                 3
 01/26/2020   03:23:18   ( -70.29, -53.78) 01/26/2020   03:22:10  ( -70.32, -53.78)    3.00                68
 01/28/2020   17:58:25   ( -70.93,  86.46) 01/28/2020   17:59:35  ( -70.82,  87.57)   42.19                70
 01/28/2020   18:49:01   (  70.40,-105.38) 01/28/2020   18:49:07  (  70.43,-105.37)    2.94                 6
 01/28/2020   19:39:42   ( -70.30,  62.11) 01/28/2020   19:38:37  ( -70.33,  62.12)    3.67                65
 01/31/2020   10:14:52   ( -71.04,-157.82) 01/31/2020   10:16:01  ( -70.93,-156.38)   53.48                69
 01/31/2020   11:05:26   (  70.41,  10.51) 01/31/2020   11:05:35  (  70.43,  10.51)    2.17                 9
 01/31/2020   11:56:08   ( -70.35, 177.93) 01/31/2020   11:55:05  ( -70.33, 178.00)    3.48                63