Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 2 15.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(TERRA) TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 02/16/2021   22:16:33   (  69.42,-154.63) 02/16/2021   22:17:27  (  69.42,-154.58)    2.20                54
 02/16/2021   23:07:14   ( -69.31,  12.84) 02/16/2021   23:06:57  ( -69.31,  12.91)    2.72                17
 02/16/2021   23:57:45   (  68.51,-178.75) 02/16/2021   23:56:36  (  68.54, 179.57)   68.54                69
 02/19/2021   14:32:53   (  69.39, -38.66) 02/19/2021   14:33:54  (  69.41, -38.72)    2.83                61
 02/19/2021   15:23:34   ( -69.28, 128.81) 02/19/2021   15:23:24  ( -69.30, 128.78)    2.79                10
 02/19/2021   16:14:09   (  68.70, -63.07) 02/19/2021   16:12:59  (  68.74, -64.29)   49.58                70
 02/22/2021   06:49:14   (  69.42,  77.22) 02/22/2021   06:50:20  (  69.45,  77.22)    2.86                66
 02/22/2021   07:39:56   ( -69.36,-115.36) 02/22/2021   07:39:50  ( -69.34,-115.29)    3.25                 6
 02/22/2021   08:30:33   (  68.89,  52.60) 02/22/2021   08:29:22  (  68.95,  51.85)   30.98                71
 02/24/2021   23:05:35   (  69.45,-166.89) 02/24/2021   23:06:46  (  69.48,-166.86)    3.26                71
 02/24/2021   23:56:16   ( -69.33,   0.61) 02/24/2021   23:56:17  ( -69.32,   0.57)    1.81                 1
 02/25/2021   00:46:58   (  69.13, 168.20) 02/25/2021   00:45:45  (  69.15, 167.98)    8.51                73
 02/27/2021   15:21:58   (  69.64, -51.24) 02/27/2021   15:23:10  (  69.56, -50.86)   16.98                72
 02/27/2021   16:12:36   ( -69.35, 116.51) 02/27/2021   16:12:42  ( -69.35, 116.49)    0.61                 6
 02/27/2021   17:03:19   (  69.22, -75.99) 02/27/2021   17:02:09  (  69.23, -76.02)    1.85                70