Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/26/2021   09:59:02   (   0.01,-128.36) (   0.12,-128.86)   56.42                80
 06/27/2021   09:42:57   (   0.02,-128.34) (  -0.85,-124.32)  457.77                80
 06/28/2021   22:02:15   (  -0.01,-128.23) (  -0.34,-129.63)  159.39                80
 06/29/2021   21:46:11   (  -0.02,-128.22) (   0.69,-125.10)  355.21                80
 07/01/2021   10:05:20   (   0.00,-128.27) (   0.48,-130.38)  239.79                80
 07/02/2021   09:49:17   (   0.01,-128.25) (  -0.55,-125.85)  274.37                80
 07/03/2021   22:08:34   (   0.01,-128.13) (  -0.64,-131.16)  343.86                80
 07/04/2021   21:52:30   (  -0.00,-128.11) (   0.34,-126.62)  170.23                80
 07/06/2021   10:11:39   (  -0.02,-128.17) (   0.83,-131.90)  425.24                80
 07/07/2021   09:55:36   (  -0.01,-128.14) (  -0.20,-127.37)   88.17                80