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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/10/2021   10:12:22   (   0.28,-128.02) (   1.14,-131.90)  441.19                80
 10/11/2021   09:56:17   (   0.29,-128.05) (   0.13,-127.36)   78.56                80
 10/13/2021   21:59:30   (  -0.27,-128.10) (  -0.26,-128.14)    5.27                80
 10/16/2021   09:59:54   (   0.25,-128.18) (   0.41,-128.88)   79.79                80
 10/17/2021   09:43:49   (   0.26,-128.21) (  -0.60,-124.35)  439.79                80
 10/18/2021   22:03:07   (  -0.24,-128.23) (  -0.53,-129.66)  163.12                80
 10/19/2021   21:47:01   (  -0.25,-128.25) (   0.43,-125.12)  356.49                80
 10/21/2021   10:06:11   (   0.22,-128.31) (   0.68,-130.40)  238.33                80
 10/22/2021   09:50:06   (   0.24,-128.33) (  -0.33,-125.87)  280.92                80
 10/23/2021   22:09:22   (  -0.21,-128.34) (  -0.85,-131.17)  322.90                80