Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 28.  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)
 09/28/2021   10:27:13   ( -71.73,-159.36) 09/28/2021   10:28:24  ( -71.64,-158.29)   38.74                71
 09/28/2021   11:17:50   (  71.26,   8.80) 09/28/2021   11:17:56  (  71.28,   8.76)    2.64                 6
 09/28/2021   12:08:31   ( -71.17, 176.28) 09/28/2021   12:07:26  ( -71.16, 176.20)    2.92                65
 10/01/2021   02:43:40   ( -72.21, -44.31) 10/01/2021   02:44:46  ( -72.08, -41.65)   91.78                66
 10/01/2021   03:34:08   (  71.28, 124.72) 10/01/2021   03:34:26  (  71.29, 124.66)    2.82                18
 10/01/2021   04:24:50   ( -71.24, -67.89) 10/01/2021   04:23:55  ( -71.23, -67.81)    2.67                55
 10/03/2021   19:50:27   (  71.35,-119.46) 10/03/2021   19:50:55  (  71.35,-119.37)    3.04                28
 10/03/2021   20:41:08   ( -71.25,  48.04) 10/03/2021   20:40:25  ( -71.24,  48.07)    2.00                43
 10/06/2021   12:06:45   (  71.37,  -3.54) 10/06/2021   12:07:25  (  71.35,  -3.50)    2.40                40
 10/06/2021   12:57:25   ( -71.27, 163.96) 10/06/2021   12:56:54  ( -71.24, 163.95)    3.11                31
 10/09/2021   04:23:02   (  71.39, 112.37) 10/09/2021   04:23:53  (  71.40, 112.46)    3.31                51
 10/09/2021   05:13:43   ( -71.28, -80.13) 10/09/2021   05:13:23  ( -71.29, -80.09)    1.39                20
 10/09/2021   06:04:11   (  70.35,  88.75) 10/09/2021   06:03:05  (  70.37,  86.14)   97.41                66
 10/11/2021   20:39:20   (  71.41,-131.72) 10/11/2021   20:40:23  (  71.38,-131.69)    3.30                63
 10/11/2021   21:30:01   ( -71.30,  35.79) 10/11/2021   21:29:53  ( -71.28,  35.77)    2.97                 8
 10/11/2021   22:20:36   (  70.74,-155.94) 10/11/2021   22:19:26  (  70.85,-157.26)   49.83                70