Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 10.  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)
 03/11/2021   05:36:25   ( -71.51, -87.67) 03/11/2021   05:37:34  ( -71.39, -86.15)   55.55                69
 03/11/2021   06:26:59   (  70.92,  80.66) 03/11/2021   06:27:08  (  70.92,  80.74)    3.11                 9
 03/11/2021   07:17:40   ( -70.79,-111.79) 03/11/2021   07:16:38  ( -70.80,-111.80)    1.35                62
 03/13/2021   21:52:50   ( -71.75,  27.82) 03/13/2021   21:53:57  ( -71.63,  30.13)   82.01                67
 03/13/2021   22:43:19   (  70.92,-163.39) 03/13/2021   22:43:35  (  70.94,-163.34)    3.08                16
 03/13/2021   23:34:01   ( -70.82,   4.08) 03/13/2021   23:33:05  ( -70.82,   4.12)    1.28                56
 03/16/2021   14:59:39   (  70.91, -47.45) 03/16/2021   15:00:03  (  70.90, -47.52)    2.71                24
 03/16/2021   15:50:21   ( -70.81, 120.03) 03/16/2021   15:49:32  ( -70.84, 120.03)    3.47                49
 03/19/2021   07:15:59   (  70.96,  68.41) 03/19/2021   07:16:28  (  70.97,  68.47)    2.62                29
 03/19/2021   08:06:41   ( -70.85,-124.11) 03/19/2021   08:05:58  ( -70.86,-124.06)    1.60                43
 03/21/2021   23:32:19   (  70.95,-175.66) 03/21/2021   23:32:55  (  70.98,-175.63)    2.54                36
 03/22/2021   00:23:01   ( -70.85,  -8.16) 03/22/2021   00:22:25  ( -70.87,  -8.16)    2.59                36