Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 18.  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   01:54:12   (  71.92, 149.22) 12/20/2021   01:55:22  (  71.80, 150.20)   36.27                70
 12/20/2021   02:44:49   ( -71.51, -42.72) 12/20/2021   02:44:55  ( -71.53, -42.63)    3.37                 6
 12/20/2021   03:35:33   (  71.38, 124.83) 12/20/2021   03:34:23  (  71.37, 124.76)    2.48                70
 12/22/2021   17:21:16   ( -71.69,  97.88) 12/22/2021   17:22:27  ( -71.65,  98.17)   11.05                71
 12/22/2021   18:11:59   (  71.51, -94.49) 12/22/2021   18:11:55  (  71.49, -94.44)    2.16                 4
 12/22/2021   19:02:39   ( -71.25,  73.29) 12/22/2021   19:01:26  ( -71.33,  72.92)   15.73                73
 12/25/2021   08:48:25   (  71.59,  46.28) 12/25/2021   08:49:28  (  71.61,  46.35)    3.19                63
 12/25/2021   09:39:08   ( -71.48,-146.20) 12/25/2021   09:38:58  ( -71.50,-146.20)    2.17                10
 12/25/2021   10:29:43   (  70.89,  22.13) 12/25/2021   10:28:34  (  70.90,  20.50)   59.35                69
 12/28/2021   00:15:34   ( -71.55,  -5.43) 12/28/2021   00:16:32  ( -71.55,  -5.51)    2.76                58
 12/28/2021   01:06:19   (  71.49, 161.99) 12/28/2021   01:05:58  (  71.50, 162.06)    2.33                21
 12/28/2021   01:56:48   ( -70.65, -29.25) 12/28/2021   01:55:41  ( -70.69, -31.60)   86.62                67
 12/30/2021   15:42:45   (  71.58, -57.25) 12/30/2021   15:43:31  (  71.60, -57.18)    3.30                46
 12/30/2021   16:33:29   ( -71.51, 110.19) 12/30/2021   16:33:01  ( -71.49, 110.28)    3.46                28