Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2021   10:44:07   (   0.03,-137.20) (   0.64,-139.95)  312.78                80
 09/18/2021   10:28:03   (   0.03,-137.20) (  -0.36,-135.42)  203.34                80
 09/19/2021   22:47:20   (  -0.02,-137.19) (  -0.81,-140.72)  402.77                80
 09/20/2021   22:31:15   (  -0.02,-137.19) (   0.19,-136.19)  113.41                80
 09/22/2021   10:50:24   (   0.02,-137.19) (   0.98,-141.46)  486.46                80
 09/23/2021   10:34:19   (   0.02,-137.19) (  -0.02,-136.93)   29.49                80
 09/25/2021   22:34:52   (  -0.02,-137.16) (  -0.13,-137.71)   61.83                80
 09/26/2021   22:18:48   (  -0.02,-137.15) (   0.87,-133.17)  453.43                80
 09/28/2021   10:37:56   (   0.02,-137.14) (   0.30,-138.44)  148.18                80
 09/29/2021   10:21:51   (   0.01,-137.13) (  -0.70,-133.91)  366.51                80