Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 6 29.  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)
 06/30/2021   23:15:59   (  70.47,-170.14) 06/30/2021   23:17:08  (  70.40,-168.72)   53.53                69
 07/01/2021   00:06:30   ( -69.83,  -1.82) 07/01/2021   00:06:46  ( -69.85,  -1.87)    2.63                16
 07/01/2021   00:57:13   (  69.74, 165.63) 07/01/2021   00:56:12  (  69.74, 165.62)    0.12                61
 07/03/2021   15:32:22   (  70.75, -54.65) 07/03/2021   15:33:29  (  70.63, -52.50)   80.34                67
 07/03/2021   16:22:49   ( -69.89, 114.03) 07/03/2021   16:23:11  ( -69.86, 114.03)    3.21                22
 07/03/2021   17:13:32   (  69.75, -78.46) 07/03/2021   17:12:38  (  69.75, -78.48)    0.95                54
 07/06/2021   08:39:08   ( -69.90,-130.05) 07/06/2021   08:39:37  ( -69.87,-130.08)    3.20                29
 07/06/2021   09:29:51   (  69.77,  37.46) 07/06/2021   09:29:04  (  69.76,  37.41)    2.25                47
 07/09/2021   00:55:27   ( -69.91, -14.12) 07/09/2021   00:56:02  ( -69.93, -14.11)    2.66                35
 07/09/2021   01:46:10   (  69.79, 153.38) 07/09/2021   01:45:29  (  69.82, 153.37)    3.36                41
 07/11/2021   17:11:45   ( -69.92, 101.80) 07/11/2021   17:12:27  ( -69.93, 101.77)    1.85                42
 07/11/2021   18:02:28   (  69.80, -90.71) 07/11/2021   18:01:54  (  69.81, -90.75)    1.90                34