Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 10 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/05/2021   10:06:05   (   0.30,-127.85) (   0.86,-130.38)  287.60                80
 10/06/2021   09:50:00   (   0.32,-127.89) (  -0.15,-125.85)  232.90                80
 10/07/2021   22:09:18   (  -0.29,-127.92) (  -1.00,-131.16)  368.36                80
 10/08/2021   21:53:13   (  -0.31,-127.95) (   0.01,-126.63)  151.76                80
 10/10/2021   10:12:22   (   0.28,-128.01) (   1.16,-131.90)  442.71                80
 10/11/2021   09:56:17   (   0.29,-128.04) (   0.15,-127.36)   76.77                80
 10/13/2021   21:56:55   (  -0.27,-128.08) (  -0.27,-128.14)    7.05                75
 10/16/2021   09:59:54   (   0.25,-128.16) (   0.43,-128.88)   83.02                80
 10/17/2021   09:43:49   (   0.27,-128.18) (  -0.58,-124.35)  436.29                80