Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 19.  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)
 12/20/2021   01:54:11   (  71.88, 149.29) 12/20/2021   01:55:22  (  71.79, 150.17)   32.19                71
 12/20/2021   02:44:49   ( -71.53, -42.74) 12/20/2021   02:44:55  ( -71.51, -42.66)    3.36                 6
 12/20/2021   03:35:33   (  71.39, 124.81) 12/20/2021   03:34:22  (  71.41, 124.83)    2.89                71
 12/22/2021   17:21:16   ( -71.65,  97.95) 12/22/2021   17:22:28  ( -71.63,  98.14)    6.83                72
 12/22/2021   18:11:59   (  71.47, -94.41) 12/22/2021   18:11:56  (  71.48, -94.47)    2.35                 3
 12/22/2021   19:02:40   ( -71.26,  73.27) 12/22/2021   19:01:27  ( -71.31,  72.89)   14.44                73
 12/25/2021   08:48:25   (  71.60,  46.27) 12/25/2021   08:49:28  (  71.59,  46.32)    2.05                63
 12/25/2021   09:39:08   ( -71.49,-146.22) 12/25/2021   09:38:58  ( -71.48,-146.23)    1.22                10
 12/25/2021   10:29:42   (  70.84,  22.20) 12/25/2021   10:28:33  (  70.94,  20.55)   61.00                69
 12/28/2021   00:15:34   ( -71.56,  -5.44) 12/28/2021   00:16:31  ( -71.58,  -5.46)    2.23                57
 12/28/2021   01:06:19   (  71.50, 161.98) 12/28/2021   01:05:58  (  71.48, 162.02)    2.59                21
 12/28/2021   01:56:48   ( -70.65, -29.26) 12/28/2021   01:55:41  ( -70.66, -31.63)   87.59                67
 12/30/2021   15:42:45   (  71.58, -57.25) 12/30/2021   15:43:31  (  71.57, -57.22)    1.45                46
 12/30/2021   16:33:28   ( -71.46, 110.28) 12/30/2021   16:33:01  ( -71.46, 110.23)    1.88                27