Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/01/2021   09:43:43   (   0.34,-127.70) (  -0.39,-124.32)  385.27                80
 10/02/2021   22:03:00   (  -0.32,-127.74) (  -0.76,-129.63)  215.59                80
 10/03/2021   21:46:56   (  -0.33,-127.78) (   0.24,-125.10)  304.96                80
 10/05/2021   10:06:05   (   0.30,-127.85) (   0.86,-130.38)  288.40                80
 10/06/2021   09:50:00   (   0.32,-127.88) (  -0.15,-125.85)  231.89                80
 10/07/2021   22:09:18   (  -0.29,-127.91) (  -1.00,-131.16)  369.78                80
 10/08/2021   21:53:13   (  -0.31,-127.94) (   0.01,-126.63)  150.17                80
 10/10/2021   10:12:22   (   0.28,-128.00) (   1.16,-131.90)  444.48                80
 10/11/2021   09:56:17   (   0.29,-128.02) (   0.14,-127.36)   74.80                80
 10/13/2021   21:59:30   (  -0.27,-128.06) (  -0.27,-128.15)    9.87                80