Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 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)
 06/20/2021   10:11:52   (   0.03,-128.46) (   0.80,-131.86)  388.52                54
 06/21/2021   09:52:43   (   0.03,-128.44) (  -0.23,-127.34)  126.34                80
 06/22/2021   22:14:40   (  -0.02,-128.34) (  -0.97,-132.64)  490.21                80
 06/23/2021   21:58:36   (  -0.02,-128.33) (  -0.00,-128.10)   24.67                80
 06/26/2021   09:59:02   (   0.01,-128.37) (   0.14,-128.86)   56.13                80
 06/27/2021   09:42:58   (   0.02,-128.35) (  -0.89,-124.33)  458.11                80
 06/28/2021   22:02:15   (  -0.01,-128.23) (  -0.30,-129.64)  159.33                80
 06/29/2021   21:46:11   (  -0.02,-128.22) (   0.67,-125.10)  355.26                80
 07/01/2021   10:05:20   (   0.01,-128.28) (   0.50,-130.37)  239.41                80
 07/02/2021   09:49:17   (   0.02,-128.26) (  -0.53,-125.85)  274.79                80
 07/03/2021   22:08:34   (  -0.00,-128.14) (  -0.65,-131.16)  343.62                80