Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 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)
 12/16/2021   10:45:16   ( -70.66,-161.46) 12/16/2021   10:45:56  ( -70.68,-161.41)    3.06                40
 12/16/2021   11:36:00   (  70.51,   6.09) 12/16/2021   11:35:24  (  70.53,   6.01)    3.66                36
 12/19/2021   02:12:26   (  70.64, 146.80) 12/19/2021   02:12:52  (  70.65, 146.80)    2.17                26
 12/19/2021   03:03:09   ( -70.54, -45.73) 12/19/2021   03:02:22  ( -70.54, -45.74)    0.63                47
 12/21/2021   16:49:04   (  71.33, -73.47) 12/21/2021   16:50:12  (  71.27, -71.65)   65.49                68
 12/21/2021   17:39:36   ( -70.66,  94.99) 12/21/2021   17:39:51  ( -70.66,  95.05)    2.13                15
 12/21/2021   18:30:20   (  70.53, -97.48) 12/21/2021   18:29:18  (  70.55, -97.46)    3.27                62
 12/24/2021   08:16:07   ( -70.99,-124.64) 12/24/2021   08:17:18  ( -70.89,-124.00)   25.73                71
 12/24/2021   09:06:46   (  70.60,  43.31) 12/24/2021   09:06:48  (  70.62,  43.23)    3.24                 2
 12/24/2021   09:57:30   ( -70.54,-149.29) 12/24/2021   09:56:17  ( -70.56,-149.22)    3.02                73
 12/26/2021   23:43:13   (  70.73,-175.99) 12/26/2021   23:44:17  (  70.73,-176.00)    0.56                64
 12/27/2021   00:33:56   ( -70.61,  -8.49) 12/27/2021   00:33:47  ( -70.62,  -8.53)    1.52                 9
 12/27/2021   01:24:31   (  70.02, 159.76) 12/27/2021   01:23:22  (  70.07, 158.32)   55.01                69