Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 12/10/2023   20:16:16   (  -0.01,-104.66) (   0.38,-102.95)  194.99                80
 12/12/2023   08:38:04   (   0.01,-104.69) (   0.80,-108.22)  402.89                80
 12/13/2023   08:16:39   (   0.01,-104.69) (  -0.21,-103.69)  113.29                80
 12/14/2023   20:38:36   (  -0.01,-104.66) (  -1.00,-108.99)  494.16                80
 12/15/2023   20:22:31   (  -0.02,-104.66) (   0.01,-104.46)   22.18                80
 12/18/2023   08:25:36   (   0.00,-104.68) (   0.10,-105.21)   59.90                80
 12/19/2023   08:04:12   (  -0.00,-104.68) (  -0.92,-100.68)  456.30                80
 12/20/2023   20:26:08   (   0.00,-104.66) (  -0.27,-105.98)  150.82                80
 12/21/2023   20:10:03   (   0.00,-104.66) (   0.74,-101.45)  365.83                80
 12/23/2023   08:31:52   (   0.01,-104.69) (   0.43,-106.72)  231.23                80