Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 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)
 06/21/2021   22:36:36   (  -0.01,-137.18) (  -0.11,-137.59)   46.72                80
 06/22/2021   22:15:12   (  -0.01,-137.17) (   0.92,-133.07)  468.36                80
 06/24/2021   10:39:42   (   0.00,-137.16) (   0.25,-138.34)  134.07                80
 06/25/2021   10:18:17   (  -0.00,-137.15) (  -0.73,-133.80)  380.55                80
 06/26/2021   22:42:55   (   0.00,-137.12) (  -0.47,-139.11)  226.90                80
 06/27/2021   22:24:11   (   0.01,-137.11) (   0.56,-134.58)  287.74                80
 06/29/2021   10:46:00   (  -0.00,-137.09) (   0.61,-139.86)  315.01                80
 06/30/2021   10:24:37   (  -0.00,-137.08) (  -0.42,-135.34)  199.57                80
 07/01/2021   22:46:33   (   0.00,-137.05) (  -0.83,-140.63)  408.15                80
 07/02/2021   22:30:30   (   0.00,-137.04) (   0.21,-136.10)  106.20                80