Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2021   10:38:19   (  -0.01,-137.20) (   0.25,-138.47)  144.19                80
 12/18/2021   10:22:12   (  -0.01,-137.19) (  -0.73,-133.93)  371.95                80
 12/19/2021   22:41:27   (   0.00,-137.17) (  -0.48,-139.22)  234.18                80
 12/20/2021   22:25:21   (  -0.00,-137.16) (   0.55,-134.69)  281.58                80
 12/22/2021   10:44:27   (   0.00,-137.15) (   0.65,-139.95)  319.84                80
 12/23/2021   10:28:21   (   0.00,-137.13) (  -0.38,-135.42)  195.44                80
 12/24/2021   22:47:35   (  -0.00,-137.10) (  -0.82,-140.72)  412.01                80
 12/25/2021   22:31:30   (  -0.00,-137.09) (   0.21,-136.19)  103.04                80
 12/27/2021   10:50:35   (  -0.00,-137.07) (   0.99,-141.44)  499.14                80
 12/28/2021   10:34:30   (   0.00,-137.04) (  -0.04,-136.91)   15.55                80
 12/30/2021   22:34:58   (  -0.01,-136.97) (  -0.17,-137.67)   79.24                80