Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 9 14.  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   23:34:05   ( -68.85,   4.51) 09/15/2021   23:34:49  ( -68.87,   4.55)    2.91                44
 09/16/2021   00:24:49   (  68.73, 171.98) 09/16/2021   00:24:17  (  68.70, 171.98)    2.65                32
 09/18/2021   15:00:29   (  69.46, -47.90) 09/18/2021   15:01:39  (  69.34, -46.60)   52.40                70
 09/18/2021   15:51:00   ( -68.78, 120.37) 09/18/2021   15:51:17  ( -68.79, 120.33)    1.98                17
 09/18/2021   16:41:44   (  68.66, -72.17) 09/18/2021   16:40:44  (  68.67, -72.17)    1.28                60
 09/21/2021   07:17:13   (  68.87,  68.70) 09/21/2021   07:18:13  (  68.87,  68.67)    1.51                60
 09/21/2021   08:07:55   ( -68.77,-123.85) 09/21/2021   08:07:43  ( -68.76,-123.83)    1.21                12
 09/21/2021   08:58:29   (  68.12,  44.31) 09/21/2021   08:57:19  (  68.14,  43.06)   51.73                70
 09/23/2021   23:34:08   (  68.81,-175.45) 09/23/2021   23:34:40  (  68.83,-175.50)    2.85                32
 09/24/2021   00:24:50   ( -68.71,  -8.00) 09/24/2021   00:24:10  ( -68.73,  -7.99)    2.15                40
 09/26/2021   15:00:25   ( -69.18, 132.50) 09/26/2021   15:01:37  ( -69.08, 133.05)   24.56                72
 09/26/2021   15:51:04   (  68.81, -59.68) 09/26/2021   15:51:07  (  68.79, -59.67)    2.51                 3
 09/26/2021   16:41:46   ( -68.71, 107.78) 09/26/2021   16:40:37  ( -68.69, 107.84)    3.05                69