Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 8.  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) (   0.54,-130.51)  287.50                80
 12/09/2021   09:50:35   (   0.01,-127.95) (  -0.43,-125.96)  226.06                80
 12/10/2021   22:09:50   (   0.01,-127.91) (  -0.72,-131.27)  382.89                80
 12/11/2021   21:53:44   (   0.00,-127.88) (   0.25,-126.73)  130.84                80
 12/13/2021   10:12:50   (  -0.02,-127.82) (   0.91,-132.00)  475.60                80
 12/14/2021   09:56:44   (  -0.01,-127.79) (  -0.07,-127.45)   37.92                80
 12/16/2021   21:57:12   (   0.02,-127.71) (  -0.11,-128.22)   58.45                80
 12/17/2021   21:41:06   (   0.00,-127.67) (   0.87,-123.67)  454.64                80
 12/19/2021   10:00:12   (  -0.02,-127.60) (   0.29,-128.94)  152.87                80
 12/20/2021   09:44:06   (  -0.01,-127.56) (  -0.69,-124.40)  359.67                80
 12/21/2021   22:03:21   (   0.03,-127.50) (  -0.45,-129.71)  251.39                80