Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 20.  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)
 12/21/2021   16:49:07   (  71.46, -73.70) 12/21/2021   16:50:14  (  71.33, -71.56)   77.28                67
 12/21/2021   17:39:36   ( -70.64,  95.03) 12/21/2021   17:39:54  ( -70.66,  95.04)    2.96                18
 12/21/2021   18:30:21   (  70.55, -97.52) 12/21/2021   18:29:21  (  70.56, -97.46)    2.66                60
 12/24/2021   08:16:09   ( -71.12,-124.87) 12/24/2021   08:17:19  ( -71.01,-123.84)   39.45                70
 12/24/2021   09:06:46   (  70.63,  43.27) 12/24/2021   09:06:51  (  70.63,  43.24)    1.21                 5
 12/24/2021   09:57:29   ( -70.52,-149.25) 12/24/2021   09:56:21  ( -70.52,-149.30)    2.10                68
 12/26/2021   23:43:13   (  70.76,-176.03) 12/26/2021   23:44:21  (  70.74,-175.99)    2.20                68
 12/27/2021   00:33:56   ( -70.65,  -8.54) 12/27/2021   00:33:51  ( -70.63,  -8.53)    1.98                 5
 12/27/2021   01:24:34   (  70.21, 159.48) 12/27/2021   01:23:23  (  70.25, 158.56)   34.90                71
 12/29/2021   15:10:22   ( -70.72, 132.26) 12/29/2021   15:11:21  ( -70.73, 132.23)    1.80                59
 12/29/2021   16:01:06   (  70.60, -60.24) 12/29/2021   16:00:48  (  70.62, -60.29)    2.95                18
 12/29/2021   16:51:37   ( -69.86, 108.24) 12/29/2021   16:50:29  ( -69.91, 106.31)   73.97                68
 01/01/2022   06:37:33   (  70.74,  80.46) 01/01/2022   06:38:18  (  70.71,  80.44)    2.77                45
 01/01/2022   07:28:16   ( -70.61,-112.03) 01/01/2022   07:27:48  ( -70.60,-112.08)    2.20                28