Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2021   10:06:41   (   0.00,-127.98) (   0.59,-130.50)  287.44                80
 12/09/2021   09:50:35   (   0.01,-127.95) (  -0.44,-125.97)  226.16                80
 12/10/2021   22:09:50   (   0.01,-127.91) (  -0.71,-131.27)  382.74                80
 12/11/2021   21:53:44   (   0.00,-127.88) (   0.26,-126.73)  131.03                80
 12/13/2021   10:12:50   (  -0.02,-127.82) (   0.90,-132.00)  475.35                80
 12/14/2021   09:56:44   (  -0.01,-127.79) (  -0.07,-127.45)   38.16                80
 12/16/2021   21:57:13   (   0.02,-127.71) (  -0.10,-128.22)   58.06                80
 12/17/2021   21:41:06   (   0.00,-127.67) (   0.87,-123.68)  455.06                80
 12/19/2021   10:00:12   (  -0.02,-127.61) (   0.28,-128.95)  152.40                80
 12/20/2021   09:44:06   (  -0.01,-127.57) (  -0.69,-124.40)  360.18                80