Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 10 18.  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)
 10/18/2023   20:09:02   (   0.00,-104.68) (   0.80,-101.22)  395.07                80
 10/20/2023   08:30:48   (   0.00,-104.70) (   0.42,-106.47)  202.90                80
 10/21/2023   08:09:22   (   0.00,-104.69) (  -0.61,-101.94)  313.14                80
 10/22/2023   20:31:18   (   0.00,-104.65) (  -0.55,-107.24)  294.76                80
 10/23/2023   20:15:11   (   0.00,-104.65) (   0.43,-102.70)  221.67                80
 10/25/2023   08:36:57   (  -0.00,-104.67) (   0.72,-107.97)  375.57                80
 10/26/2023   08:15:31   (  -0.00,-104.67) (  -0.26,-103.43)  140.92                80
 10/27/2023   20:37:25   (  -0.00,-104.63) (  -0.94,-108.72)  466.59                80
 10/28/2023   20:21:20   (  -0.00,-104.63) (   0.11,-104.19)   50.24                80
 10/31/2023   08:24:19   (   0.02,-104.65) (   0.10,-104.91)   29.71                80
 11/01/2023   08:02:53   (   0.02,-104.65) (  -0.95,-100.38)  486.92                80