Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/10/2021   10:39:54   (   0.03,-137.18) (   0.27,-138.37)  135.19                80
 07/11/2021   10:18:30   (   0.02,-137.18) (  -0.71,-133.83)  380.54                80
 07/12/2021   22:43:07   (  -0.03,-137.17) (  -0.48,-139.14)  225.17                80
 07/13/2021   22:21:43   (  -0.03,-137.16) (   0.55,-134.62)  290.35                80
 07/15/2021   10:46:12   (   0.03,-137.15) (   0.66,-139.88)  311.37                80
 07/16/2021   10:24:48   (   0.03,-137.14) (  -0.37,-135.36)  203.79                80
 07/17/2021   22:49:25   (  -0.03,-137.12) (  -0.82,-140.66)  403.13                80
 07/18/2021   22:28:02   (  -0.02,-137.11) (   0.22,-136.14)  111.40                80
 07/20/2021   10:52:30   (   0.01,-137.09) (   1.00,-141.40)  492.26                80
 07/21/2021   10:31:07   (  -0.00,-137.07) (  -0.04,-136.88)   21.47                80
 07/23/2021   22:34:21   (   0.01,-137.01) (  -0.11,-137.66)   73.64                80