Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/26/2021   22:09:32   (   0.05,-128.03) (  -0.64,-131.23)  364.42                80
 12/27/2021   21:53:26   (   0.04,-128.05) (   0.34,-126.69)  155.67                80
 12/29/2021   10:12:32   (  -0.05,-128.10) (   0.80,-131.96)  439.71                80
 12/30/2021   09:56:25   (  -0.04,-128.12) (  -0.18,-127.42)   79.83                80
 01/01/2022   21:56:54   (   0.04,-128.16) (   0.03,-128.18)    2.51                80
 01/04/2022   09:59:54   (  -0.04,-128.21) (   0.11,-128.91)   80.37                80
 01/05/2022   09:43:48   (  -0.03,-128.22) (  -0.87,-124.37)  438.35                80
 01/06/2022   22:03:03   (   0.05,-128.24) (  -0.25,-129.68)  163.83                80
 01/07/2022   21:46:57   (   0.04,-128.26) (   0.73,-125.14)  355.03                80