Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 9 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)
 09/15/2021   23:34:04   ( -68.82,   4.55) 09/15/2021   23:34:49  ( -68.84,   4.51)    2.49                45
 09/16/2021   00:24:48   (  68.70, 172.02) 09/16/2021   00:24:16  (  68.73, 172.02)    3.43                32
 09/18/2021   15:00:29   (  69.49, -47.93) 09/18/2021   15:01:38  (  69.37, -46.56)   55.10                69
 09/18/2021   15:51:00   ( -68.81, 120.33) 09/18/2021   15:51:16  ( -68.82, 120.36)    1.54                16
 09/18/2021   16:41:44   (  68.69, -72.20) 09/18/2021   16:40:43  (  68.70, -72.14)    2.98                61
 09/21/2021   07:17:14   (  68.89,  68.67) 09/21/2021   07:18:13  (  68.89,  68.70)    1.34                59
 09/21/2021   08:07:55   ( -68.75,-123.81) 09/21/2021   08:07:44  ( -68.73,-123.86)    2.37                11
 09/21/2021   08:58:29   (  68.09,  44.35) 09/21/2021   08:57:19  (  68.17,  43.10)   52.47                70
 09/23/2021   23:34:09   (  68.84,-175.48) 09/23/2021   23:34:40  (  68.86,-175.46)    2.51                31
 09/24/2021   00:24:50   ( -68.68,  -7.96) 09/24/2021   00:24:11  ( -68.70,  -8.03)    3.32                39
 09/26/2021   15:00:25   ( -69.21, 132.47) 09/26/2021   15:01:36  ( -69.11, 133.09)   26.95                71
 09/26/2021   15:51:03   (  68.78, -59.64) 09/26/2021   15:51:07  (  68.76, -59.71)    3.43                 4
 09/26/2021   16:41:45   ( -68.68, 107.81) 09/26/2021   16:40:37  ( -68.67, 107.81)    1.60                68