Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 12 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/30/2019   22:42:37   (  -0.03,-137.21) (  -0.46,-139.05)  210.18                80
 12/31/2019   22:21:11   (  -0.02,-137.21) (   0.55,-134.51)  306.89                80
 01/02/2020   10:45:38   (   0.03,-137.22) (   0.58,-139.79)  292.35                80
 01/03/2020   10:24:13   (   0.02,-137.22) (  -0.42,-135.25)  224.41                80
 01/04/2020   22:48:48   (  -0.03,-137.22) (  -0.76,-140.55)  379.81                80
 01/05/2020   22:27:23   (  -0.03,-137.22) (   0.25,-136.02)  136.57                80
 01/07/2020   10:51:49   (   0.04,-137.21) (   0.94,-141.28)  463.89                80
 01/08/2020   10:30:24   (   0.04,-137.20) (  -0.06,-136.75)   51.87                80
 01/10/2020   22:36:13   (  -0.04,-137.17) (  -0.10,-137.52)   38.80                80
 01/11/2020   22:14:48   (  -0.04,-137.16) (   0.91,-132.98)  476.26                80