Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 8.  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)
 12/08/2023   08:10:24   (   0.00,-104.68) (  -0.57,-102.18)  284.79                80
 12/09/2023   20:32:20   (  -0.00,-104.66) (  -0.64,-107.48)  321.95                80
 12/10/2023   20:16:15   (  -0.00,-104.66) (   0.36,-102.95)  194.63                80
 12/12/2023   08:38:04   (   0.00,-104.69) (   0.82,-108.22)  403.25                80
 12/13/2023   08:16:39   (   0.01,-104.68) (  -0.19,-103.69)  112.89                80
 12/14/2023   20:38:36   (  -0.01,-104.65) (  -0.95,-109.00)  494.90                80
 12/15/2023   20:22:32   (  -0.01,-104.65) (   0.06,-104.47)   21.58                80
 12/18/2023   08:25:36   (   0.01,-104.68) (   0.11,-105.21)   60.43                80
 12/19/2023   08:04:11   (   0.00,-104.67) (  -0.91,-100.68)  455.68                80
 12/20/2023   20:26:08   (  -0.00,-104.65) (  -0.28,-105.98)  151.72                80
 12/21/2023   20:10:03   (  -0.00,-104.65) (   0.74,-101.45)  364.90                80