Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 1 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)
 01/13/2021   18:22:03   ( -68.76,  82.53) 01/13/2021   18:23:15  ( -68.64,  83.12)   27.35                72
 01/13/2021   19:12:41   (  68.32,-109.58) 01/13/2021   19:12:46  (  68.31,-109.64)    3.03                 5
 01/13/2021   20:03:22   ( -68.18,  57.92) 01/13/2021   20:02:16  ( -68.19,  57.86)    3.16                66
 01/16/2021   10:38:51   ( -68.41,-161.24) 01/16/2021   10:39:46  ( -68.41,-161.28)    1.91                55
 01/16/2021   11:29:35   (  68.30,   6.22) 01/16/2021   11:29:13  (  68.30,   6.23)    0.27                22
 01/16/2021   12:20:04   ( -67.50, 174.52) 01/16/2021   12:18:54  ( -67.57, 173.02)   64.13                70
 01/19/2021   02:05:22   (  69.45, 145.80) 01/19/2021   02:06:28  (  69.39, 148.21)   94.36                66
 01/19/2021   02:55:46   ( -68.39, -45.44) 01/19/2021   02:56:14  ( -68.40, -45.42)    1.39                28
 01/19/2021   03:46:29   (  68.22, 122.09) 01/19/2021   03:45:42  (  68.23, 122.02)    2.65                47
 01/21/2021   18:22:00   (  68.52, -97.16) 01/21/2021   18:23:12  (  68.48, -97.06)    5.37                72
 01/21/2021   19:12:40   ( -68.31,  70.43) 01/21/2021   19:12:43  ( -68.33,  70.38)    2.71                 3
 01/21/2021   20:03:23   (  68.15,-122.05) 01/21/2021   20:02:11  (  68.15,-122.19)    5.54                72
 01/24/2021   10:38:53   (  68.39,  18.78) 01/24/2021   10:39:41  (  68.40,  18.72)    2.59                48
 01/24/2021   11:29:35   ( -68.29,-173.77) 01/24/2021   11:29:11  ( -68.30,-173.77)    1.69                24
 01/24/2021   12:20:01   (  67.21,  -5.14) 01/24/2021   12:18:54  (  67.28,  -7.29)   92.80                67
 01/27/2021   02:05:20   ( -69.39, -34.12) 01/27/2021   02:06:27  ( -69.27, -31.95)   85.94                67
 01/27/2021   02:55:47   (  68.38, 134.56) 01/27/2021   02:56:08  (  68.37, 134.57)    0.27                21