Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 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)
 08/26/2021   21:56:31   (  -0.45,-128.23) (  -0.42,-128.11)   12.82                80
 08/29/2021   10:00:38   (   0.45,-128.30) (   0.55,-128.86)   64.14                18
 08/30/2021   09:40:52   (   0.44,-128.29) (  -0.44,-124.33)  451.89                80
 08/31/2021   22:05:29   (  -0.44,-128.22) (  -0.74,-129.63)  160.63                80
 09/01/2021   21:44:05   (  -0.43,-128.22) (   0.26,-125.10)  354.92                80
 09/03/2021   10:05:53   (   0.43,-128.27) (   0.92,-130.37)  239.86                80
 09/04/2021   09:49:49   (   0.43,-128.26) (  -0.13,-125.85)  275.51                80
 09/05/2021   22:09:06   (  -0.42,-128.18) (  -1.10,-131.14)  337.88                80
 09/06/2021   21:53:02   (  -0.42,-128.17) (  -0.05,-126.62)  177.30                80
 09/08/2021   10:12:11   (   0.42,-128.22) (   1.23,-131.89)  418.43                80
 09/09/2021   09:56:06   (   0.42,-128.21) (   0.23,-127.36)   96.62                80