Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 24.  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)
 12/24/2021   08:16:09   ( -71.11,-124.85) 12/24/2021   08:17:20  ( -70.97,-123.89)   37.62                71
 12/24/2021   09:06:47   (  70.66,  43.21) 12/24/2021   09:06:51  (  70.66,  43.28)    2.39                 4
 12/24/2021   09:57:30   ( -70.56,-149.31) 12/24/2021   09:56:21  ( -70.54,-149.27)    3.02                69
 12/26/2021   23:43:13   (  70.74,-176.01) 12/26/2021   23:44:22  (  70.72,-176.04)    3.24                69
 12/27/2021   00:33:56   ( -70.64,  -8.52) 12/27/2021   00:33:51  ( -70.65,  -8.50)    1.92                 5
 12/27/2021   01:24:34   (  70.19, 159.50) 12/27/2021   01:23:23  (  70.28, 158.59)   35.23                71
 12/29/2021   15:10:22   ( -70.77, 132.18) 12/29/2021   15:11:20  ( -70.76, 132.26)    3.22                58
 12/29/2021   16:01:06   (  70.65, -60.31) 12/29/2021   16:00:47  (  70.65, -60.25)    2.20                19
 12/29/2021   16:51:37   ( -69.90, 108.17) 12/29/2021   16:50:28  ( -69.93, 106.35)   69.71                69
 01/01/2022   06:37:32   (  70.74,  80.46) 01/01/2022   06:38:17  (  70.74,  80.48)    1.06                45
 01/01/2022   07:28:15   ( -70.62,-112.03) 01/01/2022   07:27:47  ( -70.63,-112.05)    1.53                28
 01/03/2022   22:04:41   ( -70.70,  28.74) 01/03/2022   22:05:17  ( -70.71,  28.68)    2.59                36
 01/03/2022   22:55:25   (  70.59,-163.77) 01/03/2022   22:54:44  (  70.60,-163.85)    2.99                41
 01/06/2022   13:31:52   (  70.74, -23.09) 01/06/2022   13:32:13  (  70.72, -23.06)    2.35                21
 01/06/2022   14:22:35   ( -70.61, 144.43) 01/06/2022   14:21:43  ( -70.61, 144.42)    0.79                52