Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 13.  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)
 12/14/2021   19:50:28   ( -71.51,  60.82) 12/14/2021   19:50:51  ( -71.52,  60.87)    1.60                23
 12/14/2021   20:41:13   (  71.42,-131.70) 12/14/2021   20:40:18  (  71.42,-131.65)    2.09                55
 12/17/2021   10:27:07   ( -72.24,-159.63) 12/17/2021   10:28:15  ( -72.14,-157.46)   74.78                68
 12/17/2021   11:17:39   (  71.49,   9.08) 12/17/2021   11:17:52  (  71.50,   9.09)    0.68                13
 12/17/2021   12:08:22   ( -71.40, 176.57) 12/17/2021   12:07:22  ( -71.39, 176.54)    1.48                60
 12/20/2021   01:54:11   (  71.88, 149.29) 12/20/2021   01:55:22  (  71.79, 150.18)   32.37                71
 12/20/2021   02:44:49   ( -71.52, -42.73) 12/20/2021   02:44:55  ( -71.52, -42.64)    3.21                 6
 12/20/2021   03:35:33   (  71.39, 124.81) 12/20/2021   03:34:23  (  71.36, 124.75)    3.42                70
 12/22/2021   17:21:17   ( -71.69,  97.87) 12/22/2021   17:22:28  ( -71.65,  98.18)   11.41                71
 12/22/2021   18:11:59   (  71.46, -94.41) 12/22/2021   18:11:56  (  71.49, -94.44)    3.17                 3
 12/22/2021   19:02:40   ( -71.25,  73.28) 12/22/2021   19:01:27  ( -71.33,  72.93)   15.43                73
 12/25/2021   08:48:24   (  71.54,  46.36) 12/25/2021   08:49:29  (  71.56,  46.27)    3.67                65
 12/25/2021   09:39:08   ( -71.48,-146.21) 12/25/2021   09:38:59  ( -71.45,-146.27)    3.25                 9