Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 9.  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, 112.38) 10/09/2021   04:23:54  (  71.37, 112.40)    2.09                52
 10/09/2021   05:13:43   ( -71.29, -80.14) 10/09/2021   05:13:23  ( -71.30, -80.08)    2.18                20
 10/09/2021   06:04:11   (  70.34,  88.75) 10/09/2021   06:03:05  (  70.39,  86.17)   96.75                66
 10/11/2021   20:39:20   (  71.41,-131.72) 10/11/2021   20:40:23  (  71.40,-131.66)    2.40                63
 10/11/2021   21:30:01   ( -71.31,  35.77) 10/11/2021   21:29:53  ( -71.28,  35.78)    3.49                 8
 10/11/2021   22:20:37   (  70.79,-156.02) 10/11/2021   22:19:27  (  70.81,-157.32)   47.44                70
 10/14/2021   12:55:39   (  71.54, -16.01) 10/14/2021   12:56:50  (  71.49, -15.64)   14.63                71
 10/14/2021   13:46:18   ( -71.34, 151.67) 10/14/2021   13:46:21  ( -71.32, 151.72)    2.90                 3
 10/14/2021   14:37:01   (  71.19, -40.75) 10/14/2021   14:35:48  (  71.22, -40.79)    4.31                73
 10/17/2021   05:12:04   (  71.94,  99.21) 10/17/2021   05:13:13  (  71.84, 100.83)   57.25                69
 10/17/2021   06:02:35   ( -71.32, -92.34) 10/17/2021   06:02:50  ( -71.35, -92.36)    3.31                15
 10/17/2021   06:53:19   (  71.22,  75.14) 10/17/2021   06:52:17  (  71.25,  75.13)    3.04                62
 10/19/2021   22:18:53   ( -71.35,  23.56) 10/19/2021   22:19:19  ( -71.37,  23.55)    2.12                26
 10/19/2021   23:09:37   (  71.26,-168.97) 10/19/2021   23:08:46  (  71.26,-168.97)    0.93                51
 10/22/2021   14:35:11   ( -71.38, 139.45) 10/22/2021   14:35:48  ( -71.38, 139.46)    0.17                37
 10/22/2021   15:25:55   (  71.30, -53.09) 10/22/2021   15:25:15  (  71.28, -53.07)    2.27                40