Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/13/2021   10:45:47   (   0.01,-137.20) (   0.60,-139.82)  298.62                80
 06/14/2021   10:24:23   (   0.00,-137.20) (  -0.43,-135.29)  216.91                80
 06/15/2021   22:49:01   (  -0.01,-137.18) (  -0.78,-140.60)  389.08                80
 06/16/2021   22:27:37   (  -0.01,-137.18) (   0.25,-136.07)  126.24                80
 06/18/2021   10:52:05   (   0.01,-137.17) (   0.98,-141.33)  475.66                80
 06/19/2021   10:30:42   (   0.01,-137.16) (  -0.05,-136.81)   39.28                80
 06/21/2021   22:36:36   (  -0.00,-137.12) (  -0.11,-137.59)   53.66                80
 06/22/2021   22:15:12   (   0.00,-137.10) (   0.92,-133.07)  460.42                80
 06/24/2021   10:39:42   (  -0.01,-137.08) (   0.25,-138.34)  143.62                80
 06/25/2021   10:18:17   (  -0.01,-137.05) (  -0.73,-133.81)  370.10                80
 06/26/2021   22:40:14   (   0.01,-137.02) (  -0.46,-139.11)  238.75                80