Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/18/2021   22:17:30   (   0.05,-137.21) (   0.99,-133.04)  474.91                80
 03/20/2021   10:39:17   (  -0.04,-137.20) (   0.19,-138.31)  126.24                80
 03/21/2021   10:17:51   (  -0.04,-137.19) (  -0.79,-133.77)  389.44                80
 03/22/2021   22:39:48   (   0.03,-137.17) (  -0.37,-139.08)  216.44                80
 03/23/2021   22:23:42   (   0.03,-137.16) (   0.62,-134.54)  298.91                80
 03/25/2021   10:45:29   (  -0.02,-137.14) (   0.56,-139.80)  303.33                80
 03/26/2021   10:24:04   (  -0.02,-137.12) (  -0.42,-135.27)  211.60                80
 03/27/2021   22:46:00   (   0.01,-137.10) (  -0.73,-140.57)  395.47                80
 03/28/2021   22:29:55   (   0.02,-137.08) (   0.25,-136.03)  119.12                80
 03/30/2021   10:51:42   (  -0.02,-137.05) (   0.92,-141.30)  484.24                80
 03/31/2021   10:30:17   (  -0.02,-137.03) (  -0.06,-136.76)   29.80                80