Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 5 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)
 05/30/2021   22:48:49   (  -0.00,-137.19) (  -0.76,-140.57)  385.32                80
 05/31/2021   22:27:26   (   0.00,-137.19) (   0.28,-136.05)  130.43                80
 06/02/2021   10:51:54   (   0.00,-137.18) (   0.93,-141.31)  470.97                80
 06/03/2021   10:30:31   (   0.00,-137.17) (  -0.11,-136.79)   44.62                80
 06/05/2021   22:33:44   (  -0.00,-137.16) (  -0.09,-137.56)   45.89                80
 06/06/2021   22:17:40   (   0.00,-137.15) (   0.95,-133.04)  469.32                80
 06/08/2021   10:39:28   (  -0.00,-137.13) (   0.26,-138.30)  133.24                80
 06/09/2021   10:18:05   (  -0.01,-137.12) (  -0.78,-133.78)  381.36                80
 06/10/2021   22:40:01   (   0.01,-137.09) (  -0.46,-139.07)  226.17                80
 06/11/2021   22:23:58   (   0.01,-137.08) (   0.59,-134.55)  288.13                80