Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 1 3.  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)
 01/05/2021   18:22:04   (  68.80, -97.52) 01/05/2021   18:23:15  (  68.72, -96.77)   31.67                71
 01/05/2021   19:12:39   ( -68.34,  70.41) 01/05/2021   19:12:50  ( -68.33,  70.39)    1.25                11
 01/05/2021   20:03:23   (  68.22,-122.12) 01/05/2021   20:02:17  (  68.22,-122.10)    1.22                66
 01/08/2021   10:38:52   (  68.45,  18.72) 01/08/2021   10:39:47  (  68.45,  18.77)    2.52                55
 01/08/2021   11:29:33   ( -68.31,-173.78) 01/08/2021   11:29:18  ( -68.28,-173.79)    2.58                15
 01/08/2021   12:20:05   (  67.54,  -5.52) 01/08/2021   12:18:55  (  67.61,  -6.93)   60.29                70
 01/11/2021   02:55:46   (  68.37, 134.59) 01/11/2021   02:56:16  (  68.39, 134.58)    1.86                30
 01/11/2021   03:46:28   ( -68.28, -57.97) 01/11/2021   03:45:46  ( -68.29, -57.91)    2.90                42
 01/13/2021   18:22:03   ( -68.78,  82.51) 01/13/2021   18:23:14  ( -68.67,  83.16)   28.92                71
 01/13/2021   19:12:41   (  68.35,-109.61) 01/13/2021   19:12:45  (  68.33,-109.61)    2.45                 4
 01/13/2021   20:03:22   ( -68.19,  57.90) 01/13/2021   20:02:15  ( -68.23,  57.90)    3.51                67
 01/16/2021   10:38:52   ( -68.43,-161.26) 01/16/2021   10:39:46  ( -68.44,-161.24)    0.92                54
 01/16/2021   11:29:35   (  68.27,   6.25) 01/16/2021   11:29:14  (  68.26,   6.19)    3.13                21
 01/16/2021   12:20:04   ( -67.47, 174.56) 01/16/2021   12:18:55  ( -67.55, 173.00)   67.13                69