Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 1 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)
 01/15/2021   18:09:39   ( -69.29,  87.09) 01/15/2021   18:10:40  ( -69.28,  87.02)    2.97                61
 01/15/2021   19:00:23   (  69.17,-105.43) 01/15/2021   19:00:07  (  69.18,-105.47)    1.59                16
 01/15/2021   19:50:55   ( -68.60,  62.67) 01/15/2021   19:49:44  ( -68.67,  61.53)   46.89                71
 01/18/2021   10:26:01   ( -69.35,-157.07) 01/18/2021   10:27:07  ( -69.33,-157.04)    3.09                66
 01/18/2021   11:16:45   (  69.23,  10.42) 01/18/2021   11:16:34  (  69.22,  10.47)    2.47                11
 01/18/2021   12:07:20   ( -68.82, 178.31) 01/18/2021   12:06:08  ( -68.89, 177.68)   26.32                72
 01/21/2021   02:42:22   ( -69.36, -41.15) 01/21/2021   02:43:34  ( -69.37, -41.10)    1.88                72
 01/21/2021   03:33:06   (  69.24, 126.33) 01/21/2021   03:33:01  (  69.25, 126.40)    3.12                 5
 01/21/2021   04:23:45   ( -69.04, -66.07) 01/21/2021   04:22:33  ( -69.04, -66.25)    7.38                72
 01/23/2021   18:58:47   ( -69.58,  74.46) 01/23/2021   18:59:59  ( -69.51,  74.97)   21.01                72
 01/23/2021   19:49:27   (  69.25,-117.75) 01/23/2021   19:49:29  (  69.23,-117.76)    2.04                 2
 01/23/2021   20:40:07   ( -69.10,  49.78) 01/23/2021   20:38:59  ( -69.13,  49.74)    3.12                68
 01/26/2021   11:15:11   ( -69.80,-169.93) 01/26/2021   11:16:22  ( -69.70,-168.89)   41.63                71
 01/26/2021   12:05:47   (  69.26,  -1.84) 01/26/2021   12:05:55  (  69.26,  -1.84)    0.58                 8
 01/26/2021   12:56:28   ( -69.16, 165.62) 01/26/2021   12:55:25  ( -69.15, 165.66)    2.03                63