Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2019 4 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)
 04/18/2019   22:05:39   (  68.85,-152.17) 04/18/2019   22:06:28  (  68.88,-152.20)    3.29                49
 04/18/2019   22:56:20   ( -68.74,  15.30) 04/18/2019   22:55:58  ( -68.77,  15.29)    2.85                22
 04/18/2019   23:46:48   (  67.77,-176.15) 04/18/2019   23:45:41  (  67.77,-178.26)   88.92                67
 04/21/2019   14:22:07   (  68.87, -36.32) 04/21/2019   14:22:57  (  68.89, -36.31)    2.15                50
 04/21/2019   15:12:48   ( -68.76, 131.15) 04/21/2019   15:12:27  ( -68.78, 131.19)    2.63                21
 04/21/2019   16:03:16   (  67.79, -60.29) 04/21/2019   16:02:09  (  67.84, -62.30)   84.73                67
 04/24/2019   06:38:34   (  68.90,  79.53) 04/24/2019   06:39:25  (  68.89,  79.57)    1.76                51
 04/24/2019   07:29:15   ( -68.79,-113.00) 04/24/2019   07:28:55  ( -68.78,-112.93)    2.76                20
 04/24/2019   08:19:44   (  67.87,  55.49) 04/24/2019   08:18:36  (  67.89,  53.64)   77.85                68
 04/26/2019   22:55:01   (  68.87,-164.55) 04/26/2019   22:55:54  (  68.87,-164.57)    0.79                53
 04/26/2019   23:45:42   ( -68.76,   2.92) 04/26/2019   23:45:24  ( -68.77,   2.93)    0.91                18
 04/27/2019   00:36:12   (  67.89, 171.34) 04/27/2019   00:35:04  (  67.93, 169.56)   74.52                68
 04/29/2019   15:11:29   (  68.90, -48.71) 04/29/2019   15:12:22  (  68.90, -48.66)    2.25                53
 04/29/2019   16:02:09   ( -68.74, 118.83) 04/29/2019   16:01:53  ( -68.74, 118.77)    2.17                16
 04/29/2019   16:52:40   (  67.93, -72.82) 04/29/2019   16:51:31  (  68.01, -74.46)   69.31                69