Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 14.  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   ( -71.48,  60.89) 12/14/2021   19:50:52  ( -71.50,  60.84)    2.60                24
 12/14/2021   20:41:13   (  71.39,-131.64) 12/14/2021   20:40:19  (  71.40,-131.67)    2.33                54
 12/17/2021   10:27:07   ( -72.26,-159.67) 12/17/2021   10:28:14  ( -72.17,-157.40)   77.72                67
 12/17/2021   11:17:39   (  71.51,   9.05) 12/17/2021   11:17:52  (  71.48,   9.06)    2.86                13
 12/17/2021   12:08:22   ( -71.42, 176.54) 12/17/2021   12:07:21  ( -71.43, 176.60)    2.46                61
 12/20/2021   01:54:11   (  71.89, 149.26) 12/20/2021   01:55:22  (  71.78, 150.16)   33.62                71
 12/20/2021   02:44:48   ( -71.48, -42.67) 12/20/2021   02:44:55  ( -71.50, -42.67)    2.26                 7
 12/20/2021   03:35:33   (  71.40, 124.78) 12/20/2021   03:34:22  (  71.40, 124.81)    0.99                71
 12/22/2021   17:21:16   ( -71.66,  97.93) 12/22/2021   17:22:28  ( -71.63,  98.15)    7.88                72
 12/22/2021   18:11:59   (  71.48, -94.44) 12/22/2021   18:11:56  (  71.47, -94.47)    1.43                 3
 12/22/2021   19:02:40   ( -71.27,  73.25) 12/22/2021   19:01:27  ( -71.31,  72.90)   13.35                73
 12/25/2021   08:48:25   (  71.56,  46.33) 12/25/2021   08:49:29  (  71.59,  46.33)    3.73                64
 12/25/2021   09:39:09   ( -71.50,-146.24) 12/25/2021   09:38:59  ( -71.49,-146.21)    1.36                10
 12/25/2021   10:29:43   (  70.86,  22.17) 12/25/2021   10:28:34  (  70.95,  20.56)   59.40                69
 12/28/2021   00:15:34   ( -71.57,  -5.46) 12/28/2021   00:16:32  ( -71.55,  -5.50)    2.70                58
 12/28/2021   01:06:18   (  71.46, 162.05) 12/28/2021   01:05:59  (  71.44, 161.96)    3.68                19