Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/19/2021   22:41:27   (   0.01,-137.20) (  -0.46,-139.23)  231.52                80
 12/20/2021   22:25:22   (   0.01,-137.20) (   0.57,-134.70)  285.17                80
 12/22/2021   10:44:27   (  -0.01,-137.20) (   0.64,-139.95)  314.92                80
 12/23/2021   10:28:21   (  -0.01,-137.19) (  -0.40,-135.42)  201.29                80
 12/24/2021   22:47:36   (   0.01,-137.17) (  -0.80,-140.72)  404.76                80
 12/25/2021   22:31:30   (   0.01,-137.16) (   0.23,-136.19)  111.23                80
 12/27/2021   10:50:35   (  -0.01,-137.16) (   0.97,-141.45)  489.57                80
 12/28/2021   10:34:30   (  -0.01,-137.14) (  -0.07,-136.92)   25.97                80
 12/30/2021   22:34:58   (  -0.00,-137.09) (  -0.15,-137.67)   66.30                80
 12/31/2021   22:18:52   (  -0.01,-137.07) (   0.89,-133.14)  448.57                80