Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 5.  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)
 10/06/2021   12:06:44   (  71.36,  -3.53) 10/06/2021   12:07:24  (  71.37,  -3.47)    2.52                40
 10/06/2021   12:57:25   ( -71.27, 163.95) 10/06/2021   12:56:54  ( -71.25, 163.97)    2.42                31
 10/09/2021   04:23:02   (  71.39, 112.37) 10/09/2021   04:23:54  (  71.36, 112.40)    3.31                52
 10/09/2021   05:13:43   ( -71.29, -80.14) 10/09/2021   05:13:23  ( -71.30, -80.07)    2.45                20
 10/09/2021   06:04:11   (  70.35,  88.74) 10/09/2021   06:03:05  (  70.39,  86.17)   96.44                66
 10/11/2021   20:39:19   (  71.37,-131.65) 10/11/2021   20:40:23  (  71.40,-131.66)    3.46                64
 10/11/2021   21:30:00   ( -71.27,  35.85) 10/11/2021   21:29:53  ( -71.28,  35.79)    2.91                 7
 10/11/2021   22:20:37   (  70.80,-156.04) 10/11/2021   22:19:26  (  70.86,-157.24)   44.25                71
 10/14/2021   12:55:39   (  71.56, -16.04) 10/14/2021   12:56:50  (  71.49, -15.64)   16.25                71
 10/14/2021   13:46:17   ( -71.30, 151.75) 10/14/2021   13:46:21  ( -71.32, 151.72)    2.48                 4
 10/14/2021   14:37:01   (  71.20, -40.77) 10/14/2021   14:35:48  (  71.22, -40.79)    2.23                73
 10/17/2021   05:12:04   (  71.96,  99.17) 10/17/2021   05:13:13  (  71.84, 100.83)   58.97                69
 10/17/2021   06:02:35   ( -71.33, -92.36) 10/17/2021   06:02:50  ( -71.35, -92.35)    1.85                15
 10/17/2021   06:53:19   (  71.24,  75.11) 10/17/2021   06:52:17  (  71.25,  75.13)    0.94                62