Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/14/2021   10:51:48   (  -0.04,-137.20) (   0.86,-141.34)  470.57                80
 03/15/2021   10:30:23   (  -0.05,-137.20) (  -0.12,-136.80)   45.46                80
 03/17/2021   22:33:34   (   0.04,-137.19) (  -0.07,-137.56)   43.68                80
 03/18/2021   22:17:29   (   0.04,-137.18) (   0.97,-133.04)  471.88                80
 03/20/2021   10:39:16   (  -0.04,-137.15) (   0.21,-138.30)  131.00                80
 03/21/2021   10:17:51   (  -0.04,-137.14) (  -0.77,-133.76)  383.93                80
 03/22/2021   22:39:47   (   0.03,-137.12) (  -0.39,-139.07)  222.48                80
 03/23/2021   22:23:42   (   0.03,-137.10) (   0.59,-134.53)  292.12                80
 03/25/2021   10:45:29   (  -0.02,-137.06) (   0.59,-139.80)  311.86                80
 03/26/2021   10:24:04   (  -0.02,-137.04) (  -0.39,-135.26)  202.32                80
 03/27/2021   22:46:00   (   0.01,-137.01) (  -0.76,-140.57)  405.33                80