Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2021   22:34:51   (  -0.05,-137.22) (  -0.17,-137.69)   54.96                80
 09/26/2021   22:18:47   (  -0.05,-137.22) (   0.84,-133.16)  461.54                80
 09/28/2021   10:37:55   (   0.04,-137.21) (   0.33,-138.43)  139.24                80
 09/29/2021   10:21:51   (   0.04,-137.21) (  -0.67,-133.90)  376.70                80
 09/30/2021   22:41:08   (  -0.03,-137.20) (  -0.48,-139.21)  229.07                80
 10/01/2021   22:25:04   (  -0.03,-137.19) (   0.53,-134.68)  286.51                80
 10/03/2021   10:44:12   (   0.02,-137.18) (   0.64,-139.95)  315.38                80
 10/04/2021   10:28:07   (   0.02,-137.17) (  -0.36,-135.41)  199.92                80
 10/05/2021   22:47:24   (  -0.02,-137.15) (  -0.84,-140.71)  406.69                80
 10/06/2021   22:31:19   (  -0.02,-137.14) (   0.17,-136.18)  108.42                80
 10/08/2021   10:50:28   (   0.02,-137.12) (   1.00,-141.45)  494.43                80