Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/01/2021   21:44:05   (  -0.44,-128.22) (   0.27,-125.10)  355.65                80
 09/03/2021   10:05:53   (   0.43,-128.27) (   0.91,-130.37)  240.12                80
 09/04/2021   09:49:49   (   0.43,-128.26) (  -0.09,-125.84)  275.24                80
 09/05/2021   22:09:06   (  -0.42,-128.19) (  -1.09,-131.14)  337.18                80
 09/06/2021   21:53:01   (  -0.42,-128.18) (  -0.09,-126.61)  177.97                80
 09/08/2021   10:12:10   (   0.42,-128.21) (   1.27,-131.88)  418.72                80
 09/09/2021   09:56:06   (   0.42,-128.20) (   0.21,-127.36)   96.34                80
 09/11/2021   21:56:38   (  -0.42,-128.11) (  -0.45,-128.12)    3.70                80
 09/14/2021   09:59:43   (   0.41,-128.11) (   0.56,-128.87)   86.67                80