Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/15/2021   22:24:58   (  -0.04,-137.20) (   0.51,-134.68)  287.16                80
 09/17/2021   10:44:07   (   0.03,-137.21) (   0.66,-139.95)  312.46                80
 09/18/2021   10:28:02   (   0.03,-137.21) (  -0.34,-135.41)  203.79                80
 09/19/2021   22:47:20   (  -0.02,-137.20) (  -0.82,-140.72)  402.16                80
 09/20/2021   22:31:15   (  -0.02,-137.20) (   0.18,-136.19)  114.17                80
 09/22/2021   10:50:23   (   0.02,-137.20) (   0.99,-141.46)  485.55                80
 09/23/2021   10:34:19   (   0.02,-137.20) (  -0.01,-136.93)   30.65                80
 09/25/2021   22:34:52   (  -0.02,-137.17) (  -0.14,-137.70)   60.48                80
 09/26/2021   22:18:47   (  -0.02,-137.16) (   0.86,-133.17)  454.89                80
 09/28/2021   10:37:56   (   0.02,-137.16) (   0.31,-138.44)  146.56                80