Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/15/2021   10:51:36   (  -0.03,-137.20) (   0.85,-141.28)  464.54                80
 04/16/2021   10:30:11   (  -0.04,-137.20) (  -0.14,-136.74)   51.73                80
 04/18/2021   22:33:22   (   0.03,-137.18) (  -0.03,-137.51)   37.37                80
 04/19/2021   22:17:16   (   0.03,-137.17) (   0.96,-132.97)  478.39                80
 04/21/2021   10:39:03   (  -0.02,-137.16) (   0.24,-138.23)  123.21                80
 04/22/2021   10:17:38   (  -0.02,-137.14) (  -0.81,-133.71)  392.15                80
 04/23/2021   22:39:33   (   0.01,-137.12) (  -0.40,-139.00)  214.19                80
 04/24/2021   22:23:28   (   0.02,-137.11) (   0.60,-134.46)  300.87                80
 04/26/2021   10:45:15   (  -0.01,-137.08) (   0.55,-139.74)  301.83                80
 04/27/2021   10:23:50   (  -0.02,-137.06) (  -0.45,-135.20)  212.69                80
 04/28/2021   22:45:45   (   0.01,-137.03) (  -0.76,-140.49)  395.19                80