Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/23/2021   10:34:19   (   0.04,-137.20) (  -0.03,-136.93)   31.75                80
 09/25/2021   22:34:52   (  -0.04,-137.19) (  -0.13,-137.70)   57.83                80
 09/26/2021   22:18:48   (  -0.04,-137.18) (   0.88,-133.17)  457.88                80
 09/28/2021   10:37:56   (   0.03,-137.17) (   0.29,-138.44)  144.04                80
 09/29/2021   10:21:52   (   0.03,-137.16) (  -0.71,-133.91)  371.04                80
 09/30/2021   22:41:08   (  -0.02,-137.14) (  -0.50,-139.21)  236.18                80
 10/01/2021   22:25:03   (  -0.02,-137.12) (   0.51,-134.67)  278.56                80
 10/03/2021   10:44:12   (   0.01,-137.10) (   0.66,-139.94)  324.48                80
 10/04/2021   10:28:07   (   0.01,-137.08) (  -0.34,-135.41)  189.99                80
 10/05/2021   22:47:24   (  -0.01,-137.05) (  -0.80,-140.72)  418.07                80
 10/06/2021   22:31:20   (  -0.01,-137.03) (   0.21,-136.19)   96.21                80