Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 17.  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)
 06/18/2021   11:53:55   (  71.14,  -0.78) 06/18/2021   11:54:35  (  71.14,  -0.73)    1.62                40
 06/18/2021   12:44:35   ( -71.03, 166.72) 06/18/2021   12:44:04  ( -71.02, 166.71)    1.80                31
 06/21/2021   04:10:13   (  71.15, 115.15) 06/21/2021   04:11:04  (  71.13, 115.13)    2.49                51
 06/21/2021   05:00:54   ( -71.04, -77.34) 06/21/2021   05:00:33  ( -71.06, -77.33)    3.00                21
 06/23/2021   20:26:32   (  71.16,-128.93) 06/23/2021   20:27:33  (  71.16,-128.93)    0.59                61
 06/23/2021   21:17:13   ( -71.04,  38.59) 06/23/2021   21:17:03  ( -71.05,  38.53)    2.68                10
 06/23/2021   22:07:47   (  70.43,-153.08) 06/23/2021   22:06:38  (  70.52,-154.65)   59.02                69
 06/26/2021   12:42:51   (  71.17, -13.01) 06/26/2021   12:44:02  (  71.20, -12.99)    2.97                71
 06/26/2021   13:33:33   ( -71.10, 154.44) 06/26/2021   13:33:32  ( -71.09, 154.47)    1.66                 1
 06/26/2021   14:24:13   (  70.81, -37.76) 06/26/2021   14:23:01  (  70.88, -38.22)   18.30                72
 06/29/2021   04:59:16   (  71.55, 102.27) 06/29/2021   05:00:26  (  71.44, 103.29)   37.98                70
 06/29/2021   05:49:51   ( -71.11, -89.64) 06/29/2021   05:50:00  ( -71.12, -89.60)    1.92                 9
 06/29/2021   06:40:35   (  71.03,  77.80) 06/29/2021   06:39:27  (  71.01,  77.88)    3.35                68