Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2019 12 22.  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)
 12/24/2019   01:16:07   (  69.65, 158.91) 12/24/2019   01:17:15  (  69.51, 160.78)   74.24                68
 12/24/2019   02:06:34   ( -68.80, -32.57) 12/24/2019   02:06:56  ( -68.79, -32.53)    2.17                22
 12/24/2019   02:57:17   (  68.63, 134.96) 12/24/2019   02:56:24  (  68.63, 134.92)    1.68                53
 12/26/2019   17:32:33   (  69.75, -85.34) 12/26/2019   17:33:40  (  69.67, -83.12)   85.87                67
 12/26/2019   18:22:58   ( -68.79,  83.34) 12/26/2019   18:23:24  ( -68.78,  83.35)    0.92                26
 12/26/2019   19:13:42   (  68.68,-109.20) 12/26/2019   19:12:51  (  68.68,-109.14)    2.62                51
 12/29/2019   09:49:01   (  69.90,  30.33) 12/29/2019   09:50:07  (  69.78,  32.90)   99.40                66
 12/29/2019   10:39:23   ( -68.79,-160.76) 12/29/2019   10:39:53  ( -68.78,-160.78)    1.30                30
 12/29/2019   11:30:07   (  68.67,   6.70) 12/29/2019   11:29:20  (  68.67,   6.73)    1.14                47
 01/01/2020   02:55:48   ( -68.78, -44.86) 01/01/2020   02:56:22  ( -68.77, -44.91)    2.88                34
 01/01/2020   03:46:32   (  68.67, 122.61) 01/01/2020   03:45:49  (  68.66, 122.60)    1.32                43
 01/03/2020   19:12:13   ( -68.78,  71.04) 01/03/2020   19:12:50  ( -68.81,  71.02)    2.79                37
 01/03/2020   20:02:57   (  68.67,-121.50) 01/03/2020   20:02:17  (  68.70,-121.47)    3.12                40