Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2021   22:34:52   (  -0.04,-137.21) (  -0.15,-137.70)   55.29                80
 09/26/2021   22:18:47   (  -0.04,-137.21) (   0.86,-133.17)  461.08                80
 09/28/2021   10:37:56   (   0.03,-137.21) (   0.31,-138.44)  139.69                80
 09/29/2021   10:21:51   (   0.03,-137.21) (  -0.69,-133.90)  376.11                80
 09/30/2021   22:41:08   (  -0.02,-137.19) (  -0.47,-139.21)  229.96                80
 10/01/2021   22:25:04   (  -0.02,-137.19) (   0.54,-134.68)  285.50                80
 10/03/2021   10:44:12   (   0.01,-137.17) (   0.63,-139.95)  316.40                80
 10/04/2021   10:28:08   (   0.01,-137.16) (  -0.38,-135.42)  198.79                80
 10/05/2021   22:47:24   (  -0.01,-137.14) (  -0.83,-140.72)  408.10                80
 10/06/2021   22:31:20   (  -0.01,-137.13) (   0.18,-136.18)  106.88                80