Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/16/2021   21:46:47   (   0.21,-128.15) (   0.90,-125.23)  334.18                80
 08/18/2021   10:05:56   (  -0.23,-128.27) (   0.29,-130.50)  255.00                80
 08/19/2021   09:49:52   (  -0.23,-128.28) (  -0.76,-125.98)  262.45                80
 08/20/2021   22:09:10   (   0.25,-128.19) (  -0.43,-131.28)  351.55                80
 08/21/2021   21:53:05   (   0.24,-128.20) (   0.56,-126.75)  165.72                80
 08/23/2021   10:12:14   (  -0.26,-128.31) (   0.56,-132.03)  423.93                80
 08/24/2021   09:56:10   (  -0.25,-128.32) (  -0.43,-127.49)   93.60                80
 08/26/2021   21:56:43   (   0.26,-128.25) (   0.24,-128.27)    3.44                80
 08/29/2021   09:59:48   (  -0.27,-128.35) (  -0.10,-129.01)   76.34                80