Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/20/2021   22:09:09   (   0.25,-128.19) (  -0.43,-131.28)  351.43                80
 08/21/2021   21:53:05   (   0.25,-128.20) (   0.56,-126.74)  165.81                80
 08/23/2021   10:12:14   (  -0.26,-128.30) (   0.56,-132.03)  424.05                80
 08/24/2021   09:56:10   (  -0.26,-128.31) (  -0.43,-127.49)   93.43                80
 08/26/2021   21:56:43   (   0.26,-128.24) (   0.23,-128.26)    3.88                80
 08/29/2021   09:59:47   (  -0.27,-128.34) (  -0.11,-129.01)   76.67                80
 08/30/2021   09:43:44   (  -0.27,-128.35) (  -1.16,-124.49)  440.07                80
 08/31/2021   22:03:00   (   0.29,-128.26) (  -0.08,-129.78)  174.41                80
 09/01/2021   21:46:57   (   0.28,-128.26) (   0.97,-125.26)  341.67                80