Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/18/2021   10:22:13   (  -0.01,-137.21) (  -0.74,-133.93)  373.23                80
 12/19/2021   22:41:27   (   0.01,-137.19) (  -0.46,-139.23)  231.92                80
 12/20/2021   22:25:22   (   0.00,-137.19) (   0.57,-134.70)  284.48                80
 12/22/2021   10:44:27   (  -0.00,-137.19) (   0.64,-139.95)  315.95                80
 12/23/2021   10:28:21   (   0.00,-137.18) (  -0.40,-135.42)  199.97                80
 12/24/2021   22:47:36   (   0.00,-137.15) (  -0.80,-140.72)  406.51                80
 12/25/2021   22:31:30   (   0.00,-137.14) (   0.23,-136.19)  109.18                80
 12/27/2021   10:50:36   (  -0.00,-137.13) (   0.97,-141.45)  492.03                80
 12/28/2021   10:34:30   (  -0.00,-137.12) (  -0.06,-136.92)   23.27                80
 12/30/2021   22:34:58   (  -0.01,-137.06) (  -0.16,-137.67)   69.84                80
 12/31/2021   22:18:52   (  -0.01,-137.04) (   0.88,-133.14)  444.59                80