Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 8.  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)
 08/08/2021   10:45:29   (  72.06,  15.10) 08/08/2021   10:46:35  (  71.97,  17.67)   89.01                66
 08/08/2021   11:35:56   ( -71.19,-176.00) 08/08/2021   11:36:17  ( -71.21,-175.97)    2.39                21
 08/08/2021   12:26:39   (  71.08,  -8.49) 08/08/2021   12:25:44  (  71.12,  -8.48)    3.55                55
 08/11/2021   03:52:15   ( -71.23, -60.11) 08/11/2021   03:52:47  ( -71.22, -60.08)    1.67                32
 08/11/2021   04:42:58   (  71.12, 107.39) 08/11/2021   04:42:14  (  71.12, 107.40)    0.72                44
 08/13/2021   20:08:33   ( -71.21,  55.85) 08/13/2021   20:09:17  ( -71.22,  55.80)    1.99                44
 08/13/2021   20:59:16   (  71.11,-136.65) 08/13/2021   20:58:44  (  71.11,-136.72)    2.80                32
 08/16/2021   12:24:52   ( -71.25, 171.73) 08/16/2021   12:25:46  ( -71.27, 171.76)    2.15                54
 08/16/2021   13:15:35   (  71.15, -20.77) 08/16/2021   13:15:13  (  71.16, -20.77)    1.59                22
 08/16/2021   14:06:03   ( -70.32, 147.91) 08/16/2021   14:04:56  ( -70.35, 145.63)   85.49                67
 08/19/2021   04:41:09   ( -71.25, -72.31) 08/19/2021   04:42:15  ( -71.26, -72.37)    2.85                66
 08/19/2021   05:31:52   (  71.14,  95.19) 08/19/2021   05:31:42  (  71.15,  95.10)    3.52                10
 08/19/2021   06:22:28   ( -70.73, -96.80) 08/19/2021   06:21:17  ( -70.78, -97.85)   38.73                71
 08/21/2021   20:57:31   ( -71.44,  43.28) 08/21/2021   20:58:43  ( -71.36,  43.67)   16.76                72
 08/21/2021   21:48:11   (  71.18,-148.94) 08/21/2021   21:48:11  (  71.19,-148.96)    0.94                 0
 08/21/2021   22:38:53   ( -71.09,  18.54) 08/21/2021   22:37:41  ( -71.09,  18.52)    0.98                72