Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 7 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/21/2019   10:40:05   (  -0.02,-137.20) (   0.26,-138.37)  133.13                80
 07/22/2019   10:18:40   (  -0.02,-137.20) (  -0.75,-133.83)  382.92                80
 07/23/2019   22:40:37   (   0.03,-137.18) (  -0.41,-139.14)  223.71                80
 07/24/2019   22:24:33   (   0.03,-137.18) (   0.60,-134.61)  292.06                80
 07/26/2019   10:46:21   (  -0.03,-137.17) (   0.55,-139.89)  308.56                80
 07/27/2019   10:24:57   (  -0.03,-137.16) (  -0.46,-135.35)  206.53                80
 07/28/2019   22:46:53   (   0.04,-137.13) (  -0.76,-140.65)  402.06                80
 07/29/2019   22:30:49   (   0.04,-137.11) (   0.25,-136.12)  112.53                80
 07/31/2019   10:49:57   (  -0.05,-137.10) (   0.90,-141.39)  489.66                80
 08/01/2019   10:33:52   (  -0.05,-137.07) (  -0.11,-136.86)   24.44                80