Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/18/2021   22:28:02   (  -0.04,-137.21) (   0.22,-136.14)  122.82                80
 07/20/2021   10:52:30   (   0.03,-137.21) (   0.99,-141.40)  478.23                80
 07/21/2021   10:31:07   (   0.03,-137.20) (  -0.05,-136.88)   37.25                80
 07/23/2021   22:34:21   (  -0.01,-137.19) (  -0.10,-137.66)   53.59                80
 07/24/2021   22:15:36   (  -0.01,-137.18) (   0.89,-133.12)  461.80                80
 07/26/2021   10:40:04   (   0.02,-137.17) (   0.32,-138.39)  139.82                80
 07/27/2021   10:18:41   (   0.03,-137.16) (  -0.72,-133.87)  375.63                80
 07/28/2021   22:40:38   (  -0.03,-137.15) (  -0.46,-139.17)  230.74                80
 07/29/2021   22:24:34   (  -0.03,-137.14) (   0.52,-134.64)  284.46                80
 07/31/2021   10:46:23   (   0.02,-137.12) (   0.63,-139.92)  317.96                80