Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 7 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)
 07/18/2020   06:50:42   ( -70.95,-106.28) 07/18/2020   06:51:53  ( -70.87,-105.43)   31.96                71
 07/18/2020   07:41:20   (  70.57,  61.65) 07/18/2020   07:41:24  (  70.56,  61.73)    3.29                 4
 07/18/2020   08:32:01   ( -70.42,-130.79) 07/18/2020   08:30:54  ( -70.44,-130.81)    1.96                67
 07/20/2020   23:07:10   ( -71.20,   9.21) 07/20/2020   23:08:19  ( -71.09,  10.79)   58.11                69
 07/20/2020   23:57:43   (  70.56, 177.58) 07/20/2020   23:57:54  (  70.55, 177.61)    1.50                11
 07/21/2020   00:48:25   ( -70.46, -14.95) 07/21/2020   00:47:24  ( -70.44, -14.92)    2.72                61
 07/23/2020   15:23:38   ( -71.45, 124.68) 07/23/2020   15:24:45  ( -71.30, 127.01)   84.38                67
 07/23/2020   16:14:06   (  70.56, -66.50) 07/23/2020   16:14:24  (  70.55, -66.51)    0.89                18
 07/23/2020   17:04:48   ( -70.45, 100.98) 07/23/2020   17:03:54  ( -70.44, 100.96)    1.84                54
 07/26/2020   08:30:28   (  70.55,  49.42) 07/26/2020   08:30:53  (  70.54,  49.36)    2.55                25
 07/26/2020   09:21:10   ( -70.45,-143.09) 07/26/2020   09:20:23  ( -70.44,-143.17)    2.87                47
 07/29/2020   00:46:52   (  70.60, 165.26) 07/29/2020   00:47:22  (  70.59, 165.31)    2.00                30
 07/29/2020   01:37:34   ( -70.49, -27.26) 07/29/2020   01:36:52  ( -70.49, -27.21)    1.75                42
 07/31/2020   17:03:15   (  70.59, -78.82) 07/31/2020   17:03:52  (  70.58, -78.83)    1.49                37
 07/31/2020   17:53:57   ( -70.49,  88.66) 07/31/2020   17:53:22  ( -70.48,  88.66)    0.93                35