Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 16.  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   ( -70.67,-161.48) 12/16/2021   10:45:56  ( -70.67,-161.43)    1.91                40
 12/16/2021   11:36:00   (  70.52,   6.07) 12/16/2021   11:35:24  (  70.51,   5.99)    3.20                36
 12/19/2021   02:12:27   (  70.65, 146.78) 12/19/2021   02:12:53  (  70.64, 146.78)    1.16                26
 12/19/2021   03:03:10   ( -70.56, -45.75) 12/19/2021   03:02:22  ( -70.57, -45.68)    3.33                48
 12/21/2021   16:49:04   (  71.35, -73.50) 12/21/2021   16:50:12  (  71.25, -71.68)   66.08                68
 12/21/2021   17:39:35   ( -70.62,  95.05) 12/21/2021   17:39:51  ( -70.64,  95.02)    2.26                16
 12/21/2021   18:30:20   (  70.54, -97.51) 12/21/2021   18:29:18  (  70.54, -97.49)    1.02                62
 12/24/2021   08:16:06   ( -70.96,-124.59) 12/24/2021   08:17:18  ( -70.87,-124.03)   22.36                72
 12/24/2021   09:06:46   (  70.62,  43.28) 12/24/2021   09:06:47  (  70.65,  43.28)    3.09                 1
 12/24/2021   09:57:29   ( -70.51,-149.23) 12/24/2021   09:56:17  ( -70.54,-149.25)    2.79                72
 12/26/2021   23:43:13   (  70.75,-176.03) 12/26/2021   23:44:16  (  70.76,-175.95)    2.71                63
 12/27/2021   00:33:56   ( -70.64,  -8.52) 12/27/2021   00:33:46  ( -70.65,  -8.48)    1.69                10
 12/27/2021   01:24:31   (  70.05, 159.73) 12/27/2021   01:23:21  (  70.09, 158.36)   52.10                70
 12/29/2021   15:10:22   ( -70.71, 132.27) 12/29/2021   15:11:16  ( -70.69, 132.20)    3.51                54
 12/29/2021   16:01:07   (  70.65, -60.32) 12/29/2021   16:00:42  (  70.63, -60.25)    3.57                25