Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 8 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/21/2021   10:52:49   (   0.04,-137.16) (   1.02,-141.44)  487.82                80
 08/22/2021   10:31:26   (   0.04,-137.15) (  -0.03,-136.92)   27.35                80
 08/24/2021   22:34:39   (  -0.04,-137.12) (  -0.17,-137.69)   64.67                80
 08/25/2021   22:18:34   (  -0.04,-137.11) (   0.83,-133.15)  450.43                80
 08/27/2021   10:40:22   (   0.03,-137.10) (   0.35,-138.42)  151.76                80
 08/28/2021   10:18:59   (   0.03,-137.08) (  -0.70,-133.90)  362.90                80
 08/29/2021   22:40:56   (  -0.03,-137.05) (  -0.48,-139.21)  245.43                80
 08/30/2021   22:24:52   (  -0.03,-137.03) (   0.51,-134.67)  268.77                80
 09/01/2021   10:44:00   (   0.02,-137.00) (   0.67,-139.94)  334.92                80
 09/02/2021   10:27:56   (   0.01,-136.98) (  -0.32,-135.41)  178.58                80