Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/24/2021   10:39:41   (   0.02,-137.20) (   0.29,-138.33)  128.90                80
 06/25/2021   10:18:17   (   0.01,-137.20) (  -0.74,-133.81)  386.90                80
 06/26/2021   22:42:55   (  -0.01,-137.19) (  -0.46,-139.11)  219.00                80
 06/27/2021   22:21:31   (  -0.01,-137.19) (   0.57,-134.59)  296.86                80
 06/29/2021   10:46:01   (   0.01,-137.20) (   0.59,-139.86)  303.53                80
 06/30/2021   10:24:36   (   0.01,-137.19) (  -0.38,-135.32)  212.23                80
 07/01/2021   22:49:13   (  -0.02,-137.18) (  -0.82,-140.63)  394.06                80
 07/02/2021   22:30:30   (  -0.01,-137.17) (   0.22,-136.11)  121.49                80
 07/04/2021   10:52:19   (   0.01,-137.17) (   0.95,-141.38)  479.65                80
 07/05/2021   10:30:56   (   0.00,-137.16) (  -0.08,-136.86)   35.34                80
 07/07/2021   22:34:09   (   0.01,-137.12) (  -0.13,-137.63)   58.05                80