Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 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)
 12/16/2021   10:45:16   ( -70.67,-161.48) 12/16/2021   10:45:56  ( -70.67,-161.42)    2.03                40
 12/16/2021   11:36:00   (  70.52,   6.07) 12/16/2021   11:35:24  (  70.52,   5.99)    2.95                36
 12/19/2021   02:12:27   (  70.65, 146.78) 12/19/2021   02:12:53  (  70.65, 146.79)    0.56                26
 12/19/2021   03:03:10   ( -70.55, -45.75) 12/19/2021   03:02:23  ( -70.53, -45.75)    2.89                47
 12/21/2021   16:49:04   (  71.35, -73.50) 12/21/2021   16:50:12  (  71.26, -71.66)   66.47                68
 12/21/2021   17:39:35   ( -70.62,  95.05) 12/21/2021   17:39:51  ( -70.65,  95.04)    3.41                16
 12/21/2021   18:30:20   (  70.54, -97.51) 12/21/2021   18:29:18  (  70.55, -97.48)    1.36                62
 12/24/2021   08:16:07   ( -71.01,-124.67) 12/24/2021   08:17:18  ( -70.88,-124.01)   27.84                71
 12/24/2021   09:06:46   (  70.62,  43.27) 12/24/2021   09:06:48  (  70.61,  43.22)    2.43                 2
 12/24/2021   09:57:29   ( -70.51,-149.23) 12/24/2021   09:56:18  ( -70.50,-149.31)    3.07                71
 12/26/2021   23:43:12   (  70.70,-175.94) 12/26/2021   23:44:17  (  70.72,-176.00)    3.00                65
 12/27/2021   00:33:56   ( -70.64,  -8.52) 12/27/2021   00:33:47  ( -70.61,  -8.53)    2.73                 9
 12/27/2021   01:24:31   (  70.05, 159.72) 12/27/2021   01:23:21  (  70.12, 158.39)   51.09                70