Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/06/2021   21:47:35   (  -0.03,-128.04) (   0.59,-125.23)  319.35                80
 12/08/2021   10:06:41   (   0.00,-127.98) (   0.58,-130.50)  287.36                80
 12/09/2021   09:50:35   (   0.01,-127.95) (  -0.45,-125.97)  226.27                80
 12/10/2021   22:09:50   (   0.01,-127.91) (  -0.75,-131.26)  382.60                80
 12/11/2021   21:53:44   (   0.00,-127.88) (   0.28,-126.73)  131.21                80
 12/13/2021   10:12:51   (  -0.02,-127.83) (   0.88,-132.00)  475.15                80
 12/14/2021   09:56:44   (  -0.01,-127.79) (  -0.09,-127.46)   38.38                80
 12/16/2021   21:57:13   (   0.02,-127.71) (  -0.08,-128.22)   57.76                80
 12/17/2021   21:41:06   (   0.00,-127.68) (   0.89,-123.68)  455.41                80
 12/19/2021   10:00:13   (  -0.02,-127.61) (   0.26,-128.95)  152.00                80