Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 1 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)
 01/23/2020   09:25:31   ( -70.70,-144.96) 01/23/2020   09:26:43  ( -70.61,-144.51)   19.36                72
 01/23/2020   10:16:12   (  70.42,  22.79) 01/23/2020   10:16:12  (  70.40,  22.82)    3.11                 0
 01/23/2020   11:06:52   ( -70.28,-169.65) 01/23/2020   11:05:42  ( -70.28,-169.71)    2.41                70
 01/26/2020   01:41:58   ( -70.81, -29.24) 01/26/2020   01:43:09  ( -70.74, -28.44)   30.33                71
 01/26/2020   02:32:37   (  70.43, 138.68) 01/26/2020   02:32:40  (  70.41, 138.72)    2.77                 3
 01/26/2020   03:23:17   ( -70.28, -53.76) 01/26/2020   03:22:10  ( -70.30, -53.81)    3.07                67
 01/28/2020   17:58:25   ( -70.92,  86.48) 01/28/2020   17:59:36  ( -70.81,  87.55)   40.95                71
 01/28/2020   18:49:02   (  70.44,-105.44) 01/28/2020   18:49:08  (  70.42,-105.38)    3.11                 6
 01/28/2020   19:39:43   ( -70.34,  62.05) 01/28/2020   19:38:38  ( -70.32,  62.10)    2.98                65
 01/31/2020   10:14:52   ( -71.03,-157.81) 01/31/2020   10:16:02  ( -70.93,-156.39)   52.93                70
 01/31/2020   11:05:26   (  70.41,  10.52) 01/31/2020   11:05:36  (  70.43,  10.51)    3.00                10
 01/31/2020   11:56:08   ( -70.35, 177.93) 01/31/2020   11:55:06  ( -70.33, 177.99)    3.03                62
 02/03/2020   02:31:18   ( -71.15, -42.11) 02/03/2020   02:32:27  ( -71.04, -40.33)   65.25                69
 02/03/2020   03:21:50   (  70.42, 126.40) 02/03/2020   03:22:03  (  70.44, 126.40)    1.81                13
 02/03/2020   04:12:32   ( -70.36, -66.18) 02/03/2020   04:11:33  ( -70.34, -66.11)    3.51                59
 02/05/2020   18:47:45   ( -71.26,  73.59) 02/05/2020   18:48:53  ( -71.16,  75.74)   77.73                68
 02/05/2020   19:38:15   (  70.44,-117.73) 02/05/2020   19:38:31  (  70.44,-117.71)    0.76                16
 02/05/2020   20:28:56   ( -70.32,  49.78) 02/05/2020   20:28:01  ( -70.34,  49.78)    2.56                55