Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/20/2021   10:52:31   (   0.04,-137.21) (   0.97,-141.41)  478.19                80
 07/21/2021   10:31:07   (   0.03,-137.20) (  -0.07,-136.88)   37.44                80
 07/23/2021   22:34:20   (  -0.02,-137.19) (  -0.14,-137.65)   53.40                80
 07/24/2021   22:18:17   (  -0.02,-137.18) (   0.90,-133.13)  462.02                80
 07/26/2021   10:40:05   (   0.03,-137.17) (   0.31,-138.39)  139.60                80
 07/27/2021   10:18:41   (   0.03,-137.16) (  -0.73,-133.87)  375.74                80
 07/28/2021   22:40:39   (  -0.03,-137.15) (  -0.46,-139.18)  230.65                80
 07/29/2021   22:24:34   (  -0.03,-137.14) (   0.52,-134.64)  284.57                80
 07/31/2021   10:46:23   (   0.02,-137.12) (   0.63,-139.92)  317.86                80
 08/01/2021   10:24:59   (   0.02,-137.11) (  -0.35,-135.38)  196.84                80