Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/28/2021   10:37:56   (   0.04,-137.21) (   0.29,-138.44)  140.05                80
 09/29/2021   10:21:52   (   0.04,-137.20) (  -0.72,-133.91)  375.72                80
 09/30/2021   22:41:08   (  -0.03,-137.19) (  -0.50,-139.20)  229.79                80
 10/01/2021   22:25:03   (  -0.03,-137.18) (   0.51,-134.67)  285.64                80
 10/03/2021   10:44:12   (   0.02,-137.16) (   0.66,-139.94)  317.01                80
 10/04/2021   10:28:07   (   0.02,-137.15) (  -0.35,-135.41)  198.13                80
 10/05/2021   22:47:24   (  -0.02,-137.13) (  -0.80,-140.72)  408.25                80
 10/06/2021   22:31:20   (  -0.02,-137.12) (   0.21,-136.19)  106.69                80
 10/08/2021   10:50:27   (   0.02,-137.09) (   1.01,-141.45)  496.88                80
 10/09/2021   10:34:23   (   0.02,-137.07) (   0.00,-136.91)   17.47                80
 10/11/2021   22:34:55   (  -0.02,-137.01) (  -0.18,-137.68)   77.09                80