Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 26.  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) (   0.13,-128.86)   56.63                80
 06/27/2021   09:42:58   (   0.02,-128.34) (  -0.90,-124.33)  457.53                80
 06/28/2021   22:02:15   (  -0.00,-128.23) (  -0.30,-129.64)  159.54                80
 06/29/2021   21:46:11   (  -0.01,-128.21) (   0.68,-125.10)  355.00                80
 07/01/2021   10:05:20   (   0.00,-128.27) (   0.49,-130.37)  240.24                80
 07/02/2021   09:49:17   (   0.01,-128.25) (  -0.54,-125.85)  273.86                80
 07/03/2021   22:08:34   (   0.01,-128.13) (  -0.65,-131.15)  344.29                80
 07/04/2021   21:52:30   (   0.00,-128.11) (   0.32,-126.62)  169.74                80
 07/06/2021   10:11:40   (  -0.02,-128.16) (   0.79,-131.91)  425.97                80
 07/07/2021   09:55:35   (  -0.01,-128.14) (  -0.19,-127.37)   87.38                80
 07/09/2021   21:56:08   (   0.02,-127.97) (  -0.03,-128.14)   19.34                80