Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 7.  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)
 12/07/2023   08:31:47   (   0.00,-104.68) (   0.46,-106.71)  231.66                80
 12/08/2023   08:10:23   (   0.01,-104.68) (  -0.54,-102.18)  284.88                80
 12/09/2023   20:32:20   (  -0.01,-104.66) (  -0.62,-107.49)  322.01                80
 12/10/2023   20:16:16   (  -0.01,-104.66) (   0.39,-102.96)  194.59                80
 12/12/2023   08:38:04   (   0.01,-104.69) (   0.79,-108.23)  403.17                80
 12/13/2023   08:16:40   (   0.01,-104.68) (  -0.22,-103.70)  112.91                80
 12/14/2023   20:38:36   (  -0.02,-104.65) (  -0.98,-109.00)  494.99                80
 12/15/2023   20:22:31   (  -0.02,-104.65) (   0.03,-104.46)   21.18                80
 12/18/2023   08:25:35   (  -0.00,-104.67) (   0.13,-105.21)   60.85                80
 12/19/2023   08:04:11   (  -0.01,-104.67) (  -0.89,-100.68)  455.20                80
 12/20/2023   20:26:07   (   0.01,-104.64) (  -0.29,-105.98)  152.34                80