Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/01/2021   22:25:04   (  -0.04,-137.22) (   0.52,-134.67)  290.38                80
 10/03/2021   10:44:12   (   0.03,-137.23) (   0.65,-139.94)  309.29                80
 10/04/2021   10:28:07   (   0.03,-137.24) (  -0.36,-135.41)  207.88                80
 10/05/2021   22:47:25   (  -0.03,-137.25) (  -0.79,-140.72)  395.29                80
 10/06/2021   22:31:20   (  -0.03,-137.25) (   0.22,-136.19)  121.62                80
 10/08/2021   10:50:28   (   0.03,-137.25) (   0.95,-141.46)  479.01                80
 10/09/2021   10:34:24   (   0.03,-137.25) (  -0.07,-136.93)   37.35                80
 10/11/2021   22:34:56   (  -0.02,-137.24) (  -0.12,-137.70)   51.93                80
 10/12/2021   22:18:51   (  -0.02,-137.23) (   0.89,-133.16)  463.56                80
 10/14/2021   10:38:00   (   0.02,-137.21) (   0.28,-138.43)  139.01                80