Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/10/2021   22:09:49   (   0.01,-127.91) (  -0.77,-131.26)  383.06                80
 12/11/2021   21:53:44   (   0.00,-127.87) (   0.26,-126.73)  130.58                80
 12/13/2021   10:12:50   (  -0.02,-127.82) (   0.89,-132.00)  476.07                80
 12/14/2021   09:56:44   (  -0.01,-127.78) (  -0.08,-127.46)   37.28                80
 12/16/2021   21:57:13   (   0.02,-127.70) (  -0.09,-128.22)   59.22                80
 12/17/2021   21:41:06   (   0.00,-127.66) (   0.89,-123.68)  453.78                80
 12/19/2021   10:00:13   (  -0.02,-127.59) (   0.27,-128.95)  153.91                80
 12/20/2021   09:44:06   (  -0.01,-127.55) (  -0.71,-124.40)  358.53                80
 12/21/2021   22:03:20   (   0.03,-127.49) (  -0.49,-129.70)  252.64                80
 12/22/2021   21:47:15   (   0.02,-127.44) (   0.55,-125.17)  259.67                80