Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 10 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/11/2021   09:56:17   (   0.29,-128.05) (   0.16,-127.36)   78.61                80
 10/13/2021   21:56:50   (  -0.27,-128.10) (  -0.28,-128.14)    4.78                80
 10/16/2021   09:59:54   (   0.25,-128.18) (   0.44,-128.88)   79.82                80
 10/17/2021   09:43:49   (   0.26,-128.21) (  -0.58,-124.35)  439.82                80
 10/18/2021   22:03:06   (  -0.24,-128.23) (  -0.55,-129.66)  163.11                80
 10/19/2021   21:47:02   (  -0.25,-128.25) (   0.46,-125.13)  356.47                80
 10/21/2021   10:06:10   (   0.22,-128.31) (   0.70,-130.40)  238.28                80
 10/22/2021   09:50:06   (   0.24,-128.33) (  -0.32,-125.87)  280.97                80
 10/23/2021   22:09:22   (  -0.21,-128.34) (  -0.87,-131.17)  322.90                80
 10/24/2021   21:53:18   (  -0.22,-128.36) (   0.15,-126.64)  195.93                80