Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 4.  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)
 12/04/2023   20:27:28   (   0.01,-104.64) (   0.00,-106.03)  154.85                 0
 12/05/2023   20:09:59   (   0.01,-104.64) (   0.71,-101.44)  364.99                80
 12/07/2023   08:31:48   (  -0.01,-104.67) (   0.42,-106.72)  233.13                80
 12/08/2023   08:10:24   (  -0.01,-104.67) (  -0.58,-102.19)  283.02                80
 12/09/2023   20:32:20   (  -0.00,-104.64) (  -0.63,-107.49)  324.07                80
 12/10/2023   20:16:16   (  -0.01,-104.64) (   0.38,-102.95)  192.42                80
 12/12/2023   08:38:04   (   0.02,-104.66) (   0.79,-108.23)  405.61                80
 12/13/2023   08:16:39   (   0.01,-104.66) (  -0.22,-103.69)  109.98                80
 12/14/2023   20:38:36   (  -0.01,-104.62) (  -0.97,-109.00)  498.71                80
 12/15/2023   20:22:31   (  -0.00,-104.61) (   0.04,-104.47)   17.03                80
 12/18/2023   08:25:35   (  -0.01,-104.63) (   0.10,-105.21)   65.48                80