Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 13.  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)
 04/13/2023   20:33:56   (  -0.00,-104.73) (   0.00,-107.42)  299.51                 0
 04/14/2023   20:16:19   (  -0.00,-104.73) (   0.42,-102.76)  224.69                80
 04/16/2023   08:38:04   (   0.00,-104.72) (   0.74,-108.02)  376.09                80
 04/17/2023   08:16:38   (   0.00,-104.72) (  -0.27,-103.48)  140.84                80
 04/18/2023   20:38:31   (  -0.00,-104.73) (  -0.93,-108.77)  461.61                80
 04/19/2023   20:22:25   (  -0.00,-104.73) (   0.09,-104.24)   55.85                80
 04/22/2023   08:25:24   (   0.00,-104.73) (   0.04,-104.97)   26.95                80
 04/23/2023   08:03:57   (   0.00,-104.73) (  -0.98,-100.43)  490.10                80
 04/24/2023   20:25:49   (  -0.02,-104.73) (  -0.26,-105.71)  112.17                80
 04/25/2023   20:09:43   (  -0.02,-104.74) (   0.77,-101.18)  405.30                80
 04/27/2023   08:31:27   (   0.02,-104.73) (   0.43,-106.43)  194.36                80