Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 11.  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)
 12/12/2021   04:23:19   (  71.53, 112.58) 12/12/2021   04:23:48  (  71.50, 112.60)    3.20                29
 12/12/2021   05:14:01   ( -71.39, -79.87) 12/12/2021   05:13:18  ( -71.38, -79.95)    3.06                43
 12/14/2021   19:50:28   ( -71.51,  60.84) 12/14/2021   19:50:51  ( -71.53,  60.88)    2.72                23
 12/14/2021   20:41:13   (  71.41,-131.69) 12/14/2021   20:40:18  (  71.43,-131.64)    2.28                55
 12/17/2021   10:27:07   ( -72.24,-159.62) 12/17/2021   10:28:15  ( -72.15,-157.45)   74.46                68
 12/17/2021   11:17:39   (  71.49,   9.09) 12/17/2021   11:17:52  (  71.51,   9.10)    2.08                13
 12/17/2021   12:08:22   ( -71.39, 176.58) 12/17/2021   12:07:22  ( -71.40, 176.55)    1.32                60
 12/20/2021   01:54:12   (  71.92, 149.20) 12/20/2021   01:55:22  (  71.80, 150.19)   37.02                70
 12/20/2021   02:44:49   ( -71.51, -42.72) 12/20/2021   02:44:56  ( -71.48, -42.71)    3.74                 7
 12/20/2021   03:35:33   (  71.38, 124.82) 12/20/2021   03:34:23  (  71.37, 124.76)    2.60                70
 12/22/2021   17:21:17   ( -71.68,  97.88) 12/22/2021   17:22:28  ( -71.66,  98.19)   11.12                71
 12/22/2021   18:11:59   (  71.51, -94.50) 12/22/2021   18:11:55  (  71.50, -94.43)    3.00                 4
 12/22/2021   19:02:39   ( -71.25,  73.29) 12/22/2021   19:01:26  ( -71.34,  72.94)   16.10                73