Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2021   21:41:07   (   0.00,-127.65) (   0.91,-123.68)  452.52                80
 12/19/2021   10:00:12   (  -0.02,-127.57) (   0.30,-128.94)  156.02                80
 12/20/2021   09:44:07   (  -0.01,-127.53) (  -0.74,-124.41)  356.10                80
 12/21/2021   22:03:21   (   0.03,-127.46) (  -0.47,-129.70)  255.23                80
 12/22/2021   21:47:14   (   0.02,-127.42) (   0.51,-125.16)  256.77                80
 12/24/2021   10:06:21   (  -0.04,-127.34) (   0.64,-130.43)  352.14                80
 12/25/2021   09:50:14   (  -0.03,-127.29) (  -0.34,-125.89)  159.44                80
 12/26/2021   22:09:28   (   0.05,-127.21) (  -0.87,-131.18)  452.94                80
 12/27/2021   21:53:23   (   0.04,-127.16) (   0.17,-126.65)   58.65                80
 12/30/2021   09:53:42   (  -0.04,-127.02) (   0.06,-127.37)   39.73                80