Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 22.  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)
 12/23/2023   08:31:50   (   0.02,-104.71) (   0.49,-106.71)  228.34                80
 12/24/2023   08:10:26   (   0.02,-104.71) (  -0.54,-102.18)  288.50                80
 12/25/2023   20:32:22   (  -0.03,-104.69) (  -0.64,-107.48)  318.08                80
 12/26/2023   20:16:16   (  -0.03,-104.69) (   0.33,-102.94)  199.04                80
 12/28/2023   08:38:05   (   0.04,-104.73) (   0.81,-108.21)  397.18                80
 12/29/2023   08:16:40   (   0.04,-104.73) (  -0.22,-103.69)  119.79                80
 12/30/2023   20:38:36   (  -0.04,-104.71) (  -1.00,-108.98)  486.75                80
 12/31/2023   20:22:31   (  -0.04,-104.72) (   0.04,-104.45)   30.75                80
 01/03/2024   08:25:34   (   0.05,-104.77) (   0.11,-105.19)   47.20                80
 01/04/2024   08:04:08   (   0.05,-104.78) (  -0.87,-100.65)  470.19                80