Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 9 13.  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)
 09/13/2021   07:17:11   ( -68.93,-111.37) 09/13/2021   07:18:22  ( -68.93,-111.26)    4.71                71
 09/13/2021   08:07:54   (  68.75,  56.17) 09/13/2021   08:07:50  (  68.76,  56.18)    1.02                 4
 09/13/2021   08:58:33   ( -68.56,-136.25) 09/13/2021   08:57:20  ( -68.59,-136.39)    6.77                73
 09/15/2021   23:34:05   ( -68.86,   4.49) 09/15/2021   23:34:49  ( -68.85,   4.53)    1.87                44
 09/16/2021   00:24:48   (  68.69, 172.03) 09/16/2021   00:24:17  (  68.68, 171.96)    2.77                31
 09/18/2021   15:00:29   (  69.48, -47.92) 09/18/2021   15:01:38  (  69.38, -46.55)   54.60                69
 09/18/2021   15:51:00   ( -68.80, 120.35) 09/18/2021   15:51:17  ( -68.77, 120.31)    2.92                17
 09/18/2021   16:41:44   (  68.68, -72.19) 09/18/2021   16:40:44  (  68.66, -72.19)    2.54                60
 09/21/2021   07:17:14   (  68.88,  68.68) 09/21/2021   07:18:13  (  68.90,  68.71)    2.46                59
 09/21/2021   08:07:55   ( -68.73,-123.80) 09/21/2021   08:07:44  ( -68.75,-123.85)    2.58                11
 09/21/2021   08:58:29   (  68.08,  44.36) 09/21/2021   08:57:19  (  68.18,  43.11)   52.90                70
 09/23/2021   23:34:09   (  68.83,-175.47) 09/23/2021   23:34:41  (  68.81,-175.52)    2.86                32
 09/24/2021   00:24:50   ( -68.73,  -8.02) 09/24/2021   00:24:10  ( -68.71,  -8.01)    1.55                40
 09/26/2021   15:00:25   ( -69.20, 132.48) 09/26/2021   15:01:36  ( -69.12, 133.10)   25.95                71
 09/26/2021   15:51:03   (  68.77, -59.63) 09/26/2021   15:51:07  (  68.77, -59.70)    2.89                 4
 09/26/2021   16:41:45   ( -68.67, 107.83) 09/26/2021   16:40:37  ( -68.67, 107.82)    0.73                68