Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 4 15.  Predictions up to the next  14.0 days:

     Date     Time(NPP) NPP Lat/Lon Date Time(TERRA) TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 04/17/2018   02:56:18   ( -69.36, -46.78) 04/17/2018   02:57:25  ( -69.26, -44.42)   93.60                67
 04/17/2018   03:46:44   (  68.29, 121.98) 04/17/2018   03:47:08  (  68.26, 121.98)    2.80                24
 04/17/2018   04:37:25   ( -68.14, -70.51) 04/17/2018   04:36:38  ( -68.16, -70.51)    2.04                47
 04/19/2018   19:12:59   ( -68.57,  70.07) 04/19/2018   19:14:11  ( -68.48,  70.46)   18.77                72
 04/19/2018   20:03:39   (  68.24,-122.19) 04/19/2018   20:03:40  (  68.25,-122.16)    1.75                 1
 04/19/2018   20:54:20   ( -68.09,  45.32) 04/19/2018   20:53:11  ( -68.10,  45.28)    1.53                69
 04/22/2018   11:29:50   ( -68.36,-173.89) 04/22/2018   11:30:44  ( -68.36,-173.82)    2.88                54
 04/22/2018   12:20:33   (  68.20,  -6.37) 04/22/2018   12:20:12  (  68.19,  -6.38)    1.52                21
 04/22/2018   13:11:02   ( -67.40, 161.94) 04/22/2018   13:09:53  ( -67.47, 160.43)   64.58                69
 04/25/2018   03:46:44   ( -68.26, -57.99) 04/25/2018   03:47:17  ( -68.29, -58.03)    3.08                33
 04/25/2018   04:37:28   (  68.16, 109.45) 04/25/2018   04:36:44  (  68.17, 109.47)    1.65                44
 04/27/2018   19:13:04   (  68.70,-110.11) 04/27/2018   19:14:15  (  68.59,-109.43)   30.57                71
 04/27/2018   20:03:40   ( -68.28,  57.76) 04/27/2018   20:03:49  ( -68.27,  57.81)    2.14                 9
 04/27/2018   20:54:23   (  68.12,-134.73) 04/27/2018   20:53:17  (  68.10,-134.75)    2.60                66