Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/30/2021   09:40:52   (   0.44,-128.29) (  -0.47,-124.33)  451.70                80
 08/31/2021   22:05:28   (  -0.44,-128.23) (  -0.78,-129.63)  160.18                80
 09/01/2021   21:44:05   (  -0.43,-128.22) (   0.28,-125.10)  355.36                80
 09/03/2021   10:05:53   (   0.43,-128.27) (   0.90,-130.37)  240.13                80
 09/04/2021   09:49:49   (   0.43,-128.26) (  -0.10,-125.84)  275.21                80
 09/05/2021   22:09:06   (  -0.42,-128.18) (  -1.08,-131.15)  337.52                80
 09/06/2021   21:53:02   (  -0.42,-128.17) (  -0.08,-126.61)  177.62                80
 09/08/2021   10:12:10   (   0.42,-128.21) (   1.25,-131.88)  418.77                80
 09/09/2021   09:56:05   (   0.42,-128.20) (   0.25,-127.35)   96.30                80
 09/11/2021   21:56:38   (  -0.42,-128.10) (  -0.42,-128.13)    2.63                80