Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 5 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/10/2021   22:20:55   (   0.02,-137.20) (   0.61,-134.48)  308.67                80
 05/12/2021   10:45:24   (  -0.01,-137.19) (   0.54,-139.76)  292.89                80
 05/13/2021   10:24:00   (  -0.02,-137.18) (  -0.43,-135.23)  222.44                80
 05/14/2021   22:48:38   (   0.01,-137.17) (  -0.72,-140.54)  383.80                80
 05/15/2021   22:29:54   (   0.01,-137.16) (   0.25,-136.01)  131.14                80
 05/17/2021   10:51:43   (  -0.01,-137.14) (   0.90,-141.28)  471.84                80
 05/18/2021   10:30:19   (  -0.01,-137.12) (  -0.08,-136.75)   42.68                80
 05/20/2021   22:33:32   (   0.01,-137.08) (  -0.09,-137.53)   50.61                80
 05/21/2021   22:17:28   (   0.01,-137.06) (   0.89,-132.99)  463.53                80
 05/23/2021   10:39:17   (  -0.00,-137.03) (   0.26,-138.27)  140.73                80