Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 1 19.  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)
 01/21/2021   18:22:00   (  68.52, -97.16) 01/21/2021   18:23:12  (  68.48, -97.07)    5.64                72
 01/21/2021   19:12:40   ( -68.32,  70.42) 01/21/2021   19:12:43  ( -68.32,  70.37)    2.16                 3
 01/21/2021   20:03:23   (  68.15,-122.06) 01/21/2021   20:02:11  (  68.15,-122.19)    5.52                72
 01/24/2021   10:38:53   (  68.40,  18.77) 01/24/2021   10:39:41  (  68.40,  18.71)    2.18                48
 01/24/2021   11:29:35   ( -68.30,-173.79) 01/24/2021   11:29:11  ( -68.30,-173.78)    0.78                24
 01/24/2021   12:20:01   (  67.21,  -5.15) 01/24/2021   12:18:54  (  67.28,  -7.29)   92.57                67
 01/27/2021   02:05:20   ( -69.40, -34.14) 01/27/2021   02:06:27  ( -69.27, -31.96)   86.81                67
 01/27/2021   02:55:47   (  68.39, 134.55) 01/27/2021   02:56:08  (  68.37, 134.56)    1.59                21
 01/27/2021   03:46:28   ( -68.23, -57.94) 01/27/2021   03:45:39  ( -68.22, -57.99)    3.15                49
 01/29/2021   18:21:58   ( -68.49,  82.88) 01/29/2021   18:23:09  ( -68.46,  82.90)    2.78                71
 01/29/2021   19:12:41   (  68.33,-109.60) 01/29/2021   19:12:36  (  68.34,-109.60)    1.67                 5
 01/29/2021   20:03:21   ( -68.12,  57.98) 01/29/2021   20:02:08  ( -68.13,  57.79)    8.36                73
 02/01/2021   10:38:52   ( -68.43,-161.27) 02/01/2021   10:39:37  ( -68.43,-161.26)    0.61                45
 02/01/2021   11:29:36   (  68.32,   6.17) 02/01/2021   11:29:04  (  68.30,   6.24)    3.34                32