Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 12.  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   (  71.50, 112.63) 12/12/2021   04:23:49  (  71.48, 112.57)    3.21                30
 12/12/2021   05:14:02   ( -71.41, -79.91) 12/12/2021   05:13:18  ( -71.41, -79.90)    0.35                44
 12/14/2021   19:50:29   ( -71.53,  60.80) 12/14/2021   19:50:52  ( -71.50,  60.85)    3.26                23
 12/14/2021   20:41:13   (  71.38,-131.64) 12/14/2021   20:40:19  (  71.40,-131.67)    2.43                54
 12/17/2021   10:27:07   ( -72.26,-159.66) 12/17/2021   10:28:14  ( -72.18,-157.39)   77.48                67
 12/17/2021   11:17:39   (  71.51,   9.06) 12/17/2021   11:17:52  (  71.49,   9.06)    2.55                13
 12/17/2021   12:08:22   ( -71.41, 176.54) 12/17/2021   12:07:21  ( -71.43, 176.61)    2.92                61
 12/20/2021   01:54:11   (  71.89, 149.27) 12/20/2021   01:55:22  (  71.78, 150.16)   33.43                71
 12/20/2021   02:44:48   ( -71.48, -42.66) 12/20/2021   02:44:55  ( -71.51, -42.66)    3.55                 7
 12/20/2021   03:35:33   (  71.40, 124.78) 12/20/2021   03:34:22  (  71.40, 124.81)    1.09                71
 12/22/2021   17:21:16   ( -71.65,  97.94) 12/22/2021   17:22:28  ( -71.64,  98.16)    7.57                72
 12/22/2021   18:11:59   (  71.48, -94.44) 12/22/2021   18:11:56  (  71.48, -94.46)    0.94                 3
 12/22/2021   19:02:40   ( -71.26,  73.26) 12/22/2021   19:01:27  ( -71.32,  72.91)   13.92                73
 12/25/2021   08:48:25   (  71.56,  46.34) 12/25/2021   08:49:30  (  71.55,  46.26)    3.00                65
 12/25/2021   09:39:09   ( -71.49,-146.23) 12/25/2021   09:38:59  ( -71.50,-146.19)    1.67                10