Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 1 17.  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)
 01/18/2021   10:26:00   ( -69.30,-156.99) 01/18/2021   10:27:07  ( -69.32,-157.05)    2.75                67
 01/18/2021   11:16:45   (  69.23,  10.41) 01/18/2021   11:16:34  (  69.21,  10.46)    2.79                11
 01/18/2021   12:07:20   ( -68.82, 178.30) 01/18/2021   12:06:08  ( -68.88, 177.66)   26.26                72
 01/21/2021   02:42:22   ( -69.36, -41.14) 01/21/2021   02:43:34  ( -69.36, -41.11)    1.24                72
 01/21/2021   03:33:06   (  69.23, 126.34) 01/21/2021   03:33:01  (  69.25, 126.39)    2.73                 5
 01/21/2021   04:23:45   ( -69.04, -66.07) 01/21/2021   04:22:32  ( -69.08, -66.19)    7.27                73
 01/23/2021   18:58:47   ( -69.57,  74.47) 01/23/2021   18:59:59  ( -69.50,  74.96)   20.24                72
 01/23/2021   19:49:27   (  69.24,-117.74) 01/23/2021   19:49:29  (  69.23,-117.76)    1.45                 2
 01/23/2021   20:40:08   ( -69.14,  49.71) 01/23/2021   20:38:59  ( -69.12,  49.73)    2.89                69
 01/26/2021   11:15:12   ( -69.83,-169.99) 01/26/2021   11:16:22  ( -69.70,-168.89)   44.84                70
 01/26/2021   12:05:47   (  69.24,  -1.82) 01/26/2021   12:05:55  (  69.26,  -1.84)    1.54                 8
 01/26/2021   12:56:28   ( -69.15, 165.64) 01/26/2021   12:55:25  ( -69.15, 165.66)    0.92                63
 01/29/2021   03:31:37   ( -70.05, -54.39) 01/29/2021   03:32:45  ( -69.95, -52.67)   66.23                68
 01/29/2021   04:22:09   (  69.30, 114.02) 01/29/2021   04:22:22  (  69.28, 114.07)    3.23                13
 01/29/2021   05:12:49   ( -69.15, -78.44) 01/29/2021   05:11:52  ( -69.18, -78.43)    3.14                57