Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 6 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/20/2019   10:18:32   (  -0.01,-137.20) (  -0.79,-133.83)  384.24                80
 06/21/2019   22:40:28   (   0.00,-137.17) (  -0.43,-139.13)  223.35                80
 06/22/2019   22:24:24   (  -0.00,-137.17) (   0.57,-134.60)  292.53                80
 06/24/2019   10:46:12   (   0.01,-137.18) (   0.61,-139.87)  306.85                80
 06/25/2019   10:24:47   (   0.01,-137.17) (  -0.39,-135.34)  208.47                80
 06/26/2019   22:46:44   (  -0.01,-137.13) (  -0.82,-140.63)  400.65                80
 06/27/2019   22:30:40   (  -0.01,-137.11) (   0.24,-136.11)  114.45                80
 06/29/2019   10:52:29   (   0.00,-137.12) (   0.94,-141.38)  486.03                80
 06/30/2019   10:31:04   (   0.00,-137.10) (  -0.06,-136.85)   28.22                80
 07/02/2019   22:34:16   (   0.00,-137.01) (  -0.15,-137.62)   69.17                80