Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/24/2021   10:06:23   (  -0.04,-127.96) (   0.52,-130.45)  284.42                80
 12/25/2021   09:50:17   (  -0.03,-127.99) (  -0.51,-125.92)  235.72                80
 12/26/2021   22:09:31   (   0.05,-128.02) (  -0.69,-131.22)  364.79                80
 12/27/2021   21:53:26   (   0.04,-128.05) (   0.35,-126.69)  155.19                80
 12/29/2021   10:12:32   (  -0.05,-128.09) (   0.79,-131.96)  440.06                80
 12/30/2021   09:56:26   (  -0.04,-128.12) (  -0.20,-127.42)   79.37                80
 01/01/2022   21:59:35   (   0.04,-128.15) (   0.04,-128.19)    3.83                80
 01/04/2022   09:59:54   (  -0.04,-128.20) (   0.11,-128.92)   81.38                80
 01/05/2022   09:43:48   (  -0.03,-128.21) (  -0.88,-124.38)  437.24                80
 01/06/2022   22:03:02   (   0.05,-128.23) (  -0.31,-129.67)  165.43                80