Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/30/2021   22:41:08   (  -0.04,-137.20) (  -0.50,-139.20)  229.09                80
 10/01/2021   22:25:03   (  -0.04,-137.19) (   0.50,-134.67)  286.46                80
 10/03/2021   10:44:12   (   0.03,-137.17) (   0.67,-139.94)  316.23                80
 10/04/2021   10:28:07   (   0.03,-137.16) (  -0.34,-135.41)  199.03                80
 10/05/2021   22:47:24   (  -0.02,-137.14) (  -0.81,-140.72)  406.99                80
 10/06/2021   22:31:20   (  -0.03,-137.13) (   0.20,-136.19)  108.05                80
 10/08/2021   10:50:27   (   0.03,-137.10) (   1.02,-141.44)  495.56                80
 10/09/2021   10:34:23   (   0.03,-137.08) (   0.01,-136.91)   18.97                80
 10/11/2021   22:34:55   (  -0.02,-137.03) (  -0.20,-137.68)   75.22                80
 10/12/2021   22:18:50   (  -0.02,-137.00) (   0.81,-133.15)  438.45                80