Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2021   10:50:23   (   0.04,-137.21) (   1.01,-141.45)  484.61                80
 09/23/2021   10:34:20   (   0.04,-137.20) (  -0.05,-136.93)   31.77                80
 09/25/2021   22:34:51   (  -0.04,-137.19) (  -0.17,-137.70)   58.18                80
 09/26/2021   22:18:47   (  -0.04,-137.18) (   0.84,-133.16)  457.42                80
 09/28/2021   10:37:55   (   0.03,-137.17) (   0.33,-138.43)  144.42                80
 09/29/2021   10:21:51   (   0.03,-137.16) (  -0.67,-133.90)  370.60                80
 09/30/2021   22:41:08   (  -0.02,-137.13) (  -0.48,-139.21)  236.85                80
 10/01/2021   22:25:04   (  -0.02,-137.12) (   0.53,-134.68)  277.82                80
 10/03/2021   10:44:12   (   0.01,-137.09) (   0.65,-139.95)  325.15                80
 10/04/2021   10:28:07   (   0.01,-137.08) (  -0.36,-135.42)  189.25                80
 10/05/2021   22:47:24   (  -0.01,-137.04) (  -0.84,-140.71)  419.00                80