Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 5 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)
 05/18/2021   10:30:19   (  -0.01,-137.20) (  -0.11,-136.75)   51.31                80
 05/20/2021   22:36:13   (   0.01,-137.19) (  -0.06,-137.53)   38.29                80
 05/21/2021   22:14:48   (   0.01,-137.19) (   0.92,-133.00)  477.50                80
 05/23/2021   10:39:18   (  -0.01,-137.19) (   0.23,-138.28)  123.52                80
 05/24/2021   10:17:53   (  -0.01,-137.18) (  -0.75,-133.74)  391.73                80
 05/25/2021   22:42:32   (   0.01,-137.16) (  -0.39,-139.06)  215.41                80
 05/26/2021   22:21:59   (   0.01,-137.15) (   0.59,-134.52)  299.35                28
 05/28/2021   10:45:35   (  -0.01,-137.13) (   0.62,-139.79)  303.36                80
 05/29/2021   10:24:12   (  -0.01,-137.11) (  -0.42,-135.26)  210.99                80
 05/30/2021   22:46:09   (   0.00,-137.08) (  -0.77,-140.57)  397.30                80
 05/31/2021   22:30:05   (   0.00,-137.06) (   0.22,-136.03)  117.00                80