Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 15.  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)
 04/16/2023   08:38:05   (   0.00,-104.72) (   0.71,-108.03)  375.92                80
 04/17/2023   08:16:38   (   0.00,-104.72) (  -0.30,-103.49)  141.14                80
 04/18/2023   20:38:32   (  -0.00,-104.73) (  -0.90,-108.78)  461.30                80
 04/19/2023   20:22:25   (  -0.00,-104.74) (   0.12,-104.24)   56.18                80
 04/22/2023   08:25:23   (  -0.00,-104.74) (   0.07,-104.96)   26.41                80
 04/23/2023   08:03:57   (  -0.00,-104.73) (  -0.95,-100.43)  490.78                80
 04/24/2023   20:25:50   (  -0.00,-104.74) (  -0.23,-105.72)  111.83                80
 04/25/2023   20:09:43   (  -0.00,-104.74) (   0.80,-101.19)  405.66                80
 04/27/2023   08:31:28   (   0.01,-104.74) (   0.40,-106.44)  193.55                80
 04/28/2023   08:10:01   (   0.02,-104.74) (  -0.63,-101.91)  323.82                80