Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 16.  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)
 12/17/2021   10:27:07   ( -72.26,-159.66) 12/17/2021   10:28:14  ( -72.17,-157.40)   77.34                67
 12/17/2021   11:17:39   (  71.50,   9.07) 12/17/2021   11:17:52  (  71.49,   9.07)    1.83                13
 12/17/2021   12:08:22   ( -71.41, 176.54) 12/17/2021   12:07:21  ( -71.43, 176.60)    2.52                61
 12/20/2021   01:54:11   (  71.89, 149.27) 12/20/2021   01:55:22  (  71.78, 150.16)   32.91                71
 12/20/2021   02:44:48   ( -71.48, -42.66) 12/20/2021   02:44:55  ( -71.50, -42.67)    2.71                 7
 12/20/2021   03:35:33   (  71.40, 124.79) 12/20/2021   03:34:22  (  71.40, 124.81)    0.75                71
 12/22/2021   17:21:16   ( -71.65,  97.95) 12/22/2021   17:22:28  ( -71.62,  98.13)    7.13                72
 12/22/2021   18:11:59   (  71.47, -94.43) 12/22/2021   18:11:56  (  71.47, -94.48)    1.90                 3
 12/22/2021   19:02:40   ( -71.26,  73.26) 12/22/2021   19:01:27  ( -71.30,  72.89)   14.11                73
 12/25/2021   08:48:26   (  71.60,  46.25) 12/25/2021   08:49:29  (  71.58,  46.31)    3.03                63
 12/25/2021   09:39:09   ( -71.49,-146.23) 12/25/2021   09:38:59  ( -71.48,-146.23)    1.40                10
 12/25/2021   10:29:43   (  70.85,  22.19) 12/25/2021   10:28:34  (  70.94,  20.55)   60.45                69
 12/28/2021   00:15:34   ( -71.56,  -5.44) 12/28/2021   00:16:31  ( -71.59,  -5.44)    2.74                57
 12/28/2021   01:06:19   (  71.50, 161.97) 12/28/2021   01:05:58  (  71.48, 162.02)    3.17                21