Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 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)
 05/21/2021   22:14:15   (  -0.07,-128.25) (  -1.03,-132.56)  490.67                80
 05/22/2021   21:58:12   (  -0.07,-128.28) (   0.01,-128.04)   28.08                80
 05/25/2021   10:01:17   (   0.07,-128.39) (   0.16,-128.78)   44.43                80
 05/26/2021   09:39:53   (   0.07,-128.40) (  -0.88,-124.26)  472.90                80
 05/27/2021   22:01:51   (  -0.07,-128.35) (  -0.31,-129.56)  137.61                80
 05/28/2021   21:45:46   (  -0.07,-128.36) (   0.67,-125.03)  380.00                80
 05/30/2021   10:07:35   (   0.07,-128.45) (   0.48,-130.31)  210.96                80
 05/31/2021   09:46:11   (   0.07,-128.46) (  -0.50,-125.77)  306.06                80
 06/01/2021   22:08:08   (  -0.07,-128.40) (  -0.68,-131.08)  305.58                80
 06/02/2021   21:52:05   (  -0.08,-128.41) (   0.36,-126.55)  211.97                80