Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/15/2021   22:19:13   (   0.01,-137.20) (   0.90,-133.20)  455.95                80
 12/17/2021   10:38:19   (  -0.01,-137.20) (   0.26,-138.47)  144.48                80
 12/18/2021   10:22:12   (   0.00,-137.19) (  -0.72,-133.93)  371.51                80
 12/19/2021   22:41:27   (  -0.00,-137.17) (  -0.49,-139.22)  234.86                80
 12/20/2021   22:25:21   (  -0.01,-137.15) (   0.55,-134.69)  280.72                80
 12/22/2021   10:44:26   (   0.01,-137.14) (   0.66,-139.95)  320.91                80
 12/23/2021   10:25:41   (   0.01,-137.12) (  -0.37,-135.42)  194.21                80
 12/24/2021   22:47:35   (  -0.01,-137.09) (  -0.83,-140.71)  413.42                80
 12/25/2021   22:31:30   (  -0.01,-137.07) (   0.21,-136.18)  101.46                80
 12/28/2021   10:34:30   (   0.01,-137.03) (  -0.03,-136.91)   13.51                80