Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 7 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)
 07/20/2020   23:07:10   ( -71.19,   9.22) 07/20/2020   23:08:19  ( -71.09,  10.80)   57.87                69
 07/20/2020   23:57:43   (  70.55, 177.59) 07/20/2020   23:57:54  (  70.56, 177.62)    1.45                11
 07/21/2020   00:48:25   ( -70.46, -14.94) 07/21/2020   00:47:24  ( -70.45, -14.91)    1.52                61
 07/23/2020   15:23:37   ( -71.44, 124.69) 07/23/2020   15:24:44  ( -71.31, 127.02)   84.25                67
 07/23/2020   16:14:05   (  70.55, -66.49) 07/23/2020   16:14:23  (  70.56, -66.50)    0.95                18
 07/23/2020   17:04:47   ( -70.45, 100.99) 07/23/2020   17:03:53  ( -70.45, 100.97)    0.96                54
 07/26/2020   08:30:28   (  70.55,  49.43) 07/26/2020   08:30:53  (  70.55,  49.37)    2.38                25
 07/26/2020   09:21:10   ( -70.44,-143.09) 07/26/2020   09:20:23  ( -70.44,-143.16)    2.55                47
 07/29/2020   00:46:52   (  70.60, 165.26) 07/29/2020   00:47:22  (  70.59, 165.32)    2.00                30
 07/29/2020   01:37:34   ( -70.49, -27.26) 07/29/2020   01:36:52  ( -70.49, -27.21)    1.86                42
 07/31/2020   17:03:15   (  70.59, -78.82) 07/31/2020   17:03:52  (  70.58, -78.82)    1.36                37
 07/31/2020   17:53:57   ( -70.49,  88.66) 07/31/2020   17:53:22  ( -70.48,  88.66)    1.02                35