Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 6 18.  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)
 06/20/2021   01:14:37   (  68.62, 159.56) 06/20/2021   01:15:15  (  68.65, 159.58)    3.07                38
 06/20/2021   02:05:18   ( -68.48, -32.93) 06/20/2021   02:04:46  ( -68.49, -32.99)    2.56                32
 06/22/2021   16:40:59   ( -69.20, 107.24) 06/22/2021   16:42:09  ( -69.08, 108.35)   45.86                70
 06/22/2021   17:31:34   (  68.60, -84.64) 06/22/2021   17:31:43  (  68.57, -84.64)    2.72                 9
 06/22/2021   18:22:15   ( -68.45,  82.87) 06/22/2021   18:21:13  ( -68.47,  82.87)    2.04                62
 06/25/2021   08:57:47   ( -68.69,-136.31) 06/25/2021   08:58:43  ( -68.67,-136.29)    2.61                56
 06/25/2021   09:48:30   (  68.52,  31.23) 06/25/2021   09:48:10  (  68.55,  31.21)    3.06                20
 06/25/2021   10:39:00   ( -67.78,-160.52) 06/25/2021   10:37:51  ( -67.83,-162.01)   62.90                69
 06/28/2021   00:24:18   (  69.67, 170.77) 06/28/2021   00:25:24  (  69.57, 173.12)   91.67                66
 06/28/2021   01:14:42   ( -68.61, -20.44) 06/28/2021   01:15:09  ( -68.64, -20.45)    2.87                27
 06/28/2021   02:05:26   (  68.50, 147.02) 06/28/2021   02:04:36  (  68.51, 147.05)    2.03                50
 06/30/2021   16:40:57   (  68.69, -72.09) 06/30/2021   16:42:06  (  68.70, -72.13)    1.61                69
 06/30/2021   17:31:39   ( -68.59,  95.35) 06/30/2021   17:31:36  ( -68.60,  95.39)    2.01                 3
 06/30/2021   18:22:19   (  68.26, -96.91) 06/30/2021   18:21:06  (  68.31, -97.32)   17.73                73