Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 6 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/20/2020   21:58:11   (  -0.02,-127.80) (  -0.08,-127.98)   21.43                80
 06/21/2020   21:36:46   (  -0.01,-127.83) (   0.96,-123.45)  498.68                80
 06/23/2020   10:01:14   (   0.02,-127.93) (   0.21,-128.72)   90.89                80
 06/24/2020   09:39:49   (   0.01,-127.95) (  -0.83,-124.19)  428.49                80
 06/25/2020   22:04:24   (  -0.02,-127.94) (  -0.38,-129.49)  176.20                80
 06/26/2020   21:43:00   (  -0.02,-127.97) (   0.66,-124.96)  343.34                80
 06/28/2020   10:07:27   (   0.03,-128.06) (   0.52,-130.23)  246.46                80
 06/29/2020   09:46:03   (   0.02,-128.09) (  -0.53,-125.70)  272.54                80
 06/30/2020   22:10:38   (  -0.03,-128.07) (  -0.68,-130.99)  333.43                80
 07/01/2020   21:49:14   (  -0.02,-128.09) (   0.36,-126.47)  185.43                80