Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 9.  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   (   0.02,-137.18) (   0.30,-138.37)  135.27                80
 07/11/2021   10:18:30   (   0.02,-137.18) (  -0.74,-133.84)  380.42                80
 07/12/2021   22:43:07   (  -0.02,-137.17) (  -0.45,-139.15)  225.30                80
 07/13/2021   22:21:43   (  -0.02,-137.16) (   0.53,-134.61)  290.21                80
 07/15/2021   10:46:12   (   0.03,-137.15) (   0.63,-139.89)  311.55                80
 07/16/2021   10:24:48   (   0.03,-137.14) (  -0.35,-135.35)  203.60                80
 07/17/2021   22:49:25   (  -0.03,-137.12) (  -0.84,-140.66)  403.31                80
 07/18/2021   22:28:02   (  -0.02,-137.11) (   0.20,-136.13)  111.20                80
 07/20/2021   10:52:31   (   0.01,-137.08) (   0.95,-141.41)  492.47                80
 07/21/2021   10:33:46   (  -0.00,-137.07) (  -0.03,-136.88)   21.33                80