Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/18/2021   10:05:56   (  -0.24,-128.26) (   0.26,-130.50)  254.98                80
 08/19/2021   09:49:52   (  -0.23,-128.27) (  -0.74,-125.97)  262.44                80
 08/20/2021   22:09:09   (   0.25,-128.19) (  -0.45,-131.27)  351.54                80
 08/21/2021   21:53:06   (   0.25,-128.20) (   0.60,-126.75)  165.75                80
 08/23/2021   10:12:14   (  -0.26,-128.31) (   0.59,-132.02)  423.93                80
 08/24/2021   09:56:10   (  -0.25,-128.32) (  -0.46,-127.50)   93.63                80
 08/26/2021   21:59:23   (   0.26,-128.25) (   0.27,-128.27)    3.03                80
 08/29/2021   09:59:48   (  -0.27,-128.35) (  -0.14,-129.02)   76.36                80
 08/30/2021   09:43:44   (  -0.27,-128.35) (  -1.13,-124.49)  440.40                80
 08/31/2021   22:03:01   (   0.29,-128.26) (  -0.05,-129.79)  174.15                80