Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/21/2021   21:53:05   (   0.25,-128.20) (   0.58,-126.75)  165.90                80
 08/23/2021   10:12:14   (  -0.26,-128.30) (   0.60,-132.02)  424.24                80
 08/24/2021   09:56:10   (  -0.26,-128.31) (  -0.45,-127.50)   93.21                80
 08/26/2021   21:56:43   (   0.26,-128.24) (   0.26,-128.27)    2.97                80
 08/29/2021   09:59:48   (  -0.27,-128.34) (  -0.13,-129.02)   77.10                80
 08/30/2021   09:43:43   (  -0.27,-128.34) (  -1.12,-124.48)  439.55                80
 08/31/2021   22:03:01   (   0.29,-128.26) (  -0.06,-129.79)  174.79                80
 09/01/2021   21:46:56   (   0.28,-128.25) (   0.93,-125.25)  341.22                80
 09/03/2021   10:06:06   (  -0.30,-128.33) (   0.19,-130.54)  251.52                80