Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 1 14.  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,  87.03)    2.91                61
 01/15/2021   19:00:23   (  69.17,-105.43) 01/15/2021   19:00:07  (  69.17,-105.47)    1.49                16
 01/15/2021   19:50:55   ( -68.60,  62.67) 01/15/2021   19:49:44  ( -68.67,  61.53)   46.86                71
 01/18/2021   10:26:01   ( -69.35,-157.07) 01/18/2021   10:27:07  ( -69.33,-157.03)    3.04                66
 01/18/2021   11:16:45   (  69.23,  10.41) 01/18/2021   11:16:34  (  69.22,  10.47)    2.64                11
 01/18/2021   12:07:20   ( -68.82, 178.30) 01/18/2021   12:06:08  ( -68.89, 177.68)   26.25                72
 01/21/2021   02:42:22   ( -69.36, -41.15) 01/21/2021   02:43:34  ( -69.37, -41.10)    2.13                72
 01/21/2021   03:33:06   (  69.24, 126.33) 01/21/2021   03:33:01  (  69.26, 126.40)    3.24                 5
 01/21/2021   04:23:45   ( -69.04, -66.07) 01/21/2021   04:22:33  ( -69.04, -66.25)    7.19                72
 01/23/2021   18:58:48   ( -69.63,  74.38) 01/23/2021   18:59:59  ( -69.51,  74.98)   26.39                71
 01/23/2021   19:49:27   (  69.25,-117.76) 01/23/2021   19:49:29  (  69.23,-117.75)    1.98                 2
 01/23/2021   20:40:07   ( -69.10,  49.77) 01/23/2021   20:38:59  ( -69.13,  49.75)    3.29                68
 01/26/2021   11:15:12   ( -69.85,-170.02) 01/26/2021   11:16:22  ( -69.71,-168.88)   46.53                70
 01/26/2021   12:05:47   (  69.26,  -1.85) 01/26/2021   12:05:55  (  69.26,  -1.83)    0.67                 8
 01/26/2021   12:56:28   ( -69.16, 165.61) 01/26/2021   12:55:25  ( -69.16, 165.67)    2.30                63