Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 10 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/13/2021   21:59:30   (  -0.27,-128.10) (  -0.26,-128.14)    5.44                80
 10/16/2021   09:59:54   (   0.25,-128.18) (   0.41,-128.88)   79.90                80
 10/17/2021   09:43:50   (   0.26,-128.21) (  -0.61,-124.35)  439.64                80
 10/18/2021   22:03:06   (  -0.24,-128.22) (  -0.59,-129.65)  163.38                80
 10/19/2021   21:47:01   (  -0.25,-128.25) (   0.43,-125.12)  356.20                80
 10/21/2021   10:06:11   (   0.22,-128.31) (   0.67,-130.40)  238.60                80
 10/22/2021   09:50:05   (   0.24,-128.33) (  -0.29,-125.86)  280.63                80
 10/23/2021   22:09:22   (  -0.21,-128.33) (  -0.84,-131.17)  323.33                80
 10/24/2021   21:53:18   (  -0.22,-128.35) (   0.18,-126.64)  195.47                80
 10/26/2021   10:12:26   (   0.19,-128.40) (   0.98,-131.91)  400.64                80