Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 2 13.  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)
 02/14/2021   06:00:12   (  69.36,  89.53) 02/14/2021   06:01:02  (  69.36,  89.45)    2.88                50
 02/14/2021   06:50:53   ( -69.26,-103.01) 02/14/2021   06:50:32  ( -69.25,-103.06)    2.15                21
 02/14/2021   07:41:21   (  68.29,  65.61) 02/14/2021   07:40:14  (  68.30,  63.41)   90.79                67
 02/16/2021   22:16:33   (  69.38,-154.58) 02/16/2021   22:17:28  (  69.40,-154.60)    2.92                55
 02/16/2021   23:07:14   ( -69.27,  12.90) 02/16/2021   23:06:58  ( -69.30,  12.89)    2.52                16
 02/16/2021   23:57:45   (  68.47,-178.70) 02/16/2021   23:56:37  (  68.52, 179.54)   71.76                68
 02/19/2021   14:32:54   (  69.41, -38.68) 02/19/2021   14:33:55  (  69.39, -38.74)    2.97                61
 02/19/2021   15:23:35   ( -69.29, 128.80) 02/19/2021   15:23:25  ( -69.28, 128.75)    2.07                10
 02/19/2021   16:14:09   (  68.71, -63.09) 02/19/2021   16:12:59  (  68.72, -64.32)   49.63                70
 02/22/2021   06:49:14   (  69.43,  77.21) 02/22/2021   06:50:20  (  69.42,  77.19)    1.29                66
 02/22/2021   07:39:55   ( -69.31,-115.30) 02/22/2021   07:39:50  ( -69.32,-115.32)    1.25                 5
 02/22/2021   08:30:33   (  68.90,  52.59) 02/22/2021   08:29:21  (  68.98,  51.89)   29.33                72
 02/24/2021   23:05:35   (  69.46,-166.90) 02/24/2021   23:06:46  (  69.45,-166.89)    0.76                71
 02/24/2021   23:56:16   ( -69.33,   0.60) 02/24/2021   23:56:16  ( -69.35,   0.61)    2.40                 0
 02/25/2021   00:46:57   (  69.09, 168.26) 02/25/2021   00:45:45  (  69.12, 167.95)   12.69                72