Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 7.  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)
 10/09/2021   04:23:02   (  71.38, 112.37) 10/09/2021   04:23:54  (  71.36, 112.39)    2.74                52
 10/09/2021   05:13:43   ( -71.29, -80.14) 10/09/2021   05:13:23  ( -71.29, -80.08)    2.04                20
 10/09/2021   06:04:11   (  70.35,  88.75) 10/09/2021   06:03:05  (  70.38,  86.16)   96.83                66
 10/11/2021   20:39:20   (  71.41,-131.72) 10/11/2021   20:40:23  (  71.40,-131.66)    2.44                63
 10/11/2021   21:30:00   ( -71.26,  35.86) 10/11/2021   21:29:53  ( -71.28,  35.78)    3.68                 7
 10/11/2021   22:20:37   (  70.79,-156.02) 10/11/2021   22:19:27  (  70.81,-157.33)   47.62                70
 10/14/2021   12:55:39   (  71.54, -16.01) 10/14/2021   12:56:50  (  71.49, -15.64)   14.44                71
 10/14/2021   13:46:18   ( -71.34, 151.68) 10/14/2021   13:46:21  ( -71.32, 151.71)    2.68                 3
 10/14/2021   14:37:01   (  71.18, -40.75) 10/14/2021   14:35:48  (  71.22, -40.80)    4.29                73
 10/17/2021   05:12:04   (  71.93,  99.21) 10/17/2021   05:13:13  (  71.83, 100.82)   56.82                69
 10/17/2021   06:02:36   ( -71.36, -92.42) 10/17/2021   06:02:50  ( -71.34, -92.36)    2.85                14
 10/17/2021   06:53:20   (  71.27,  75.06) 10/17/2021   06:52:17  (  71.24,  75.12)    3.37                63
 10/19/2021   22:18:53   ( -71.34,  23.57) 10/19/2021   22:19:19  ( -71.37,  23.55)    3.21                26
 10/19/2021   23:09:37   (  71.25,-168.96) 10/19/2021   23:08:46  (  71.26,-168.97)    1.76                51