Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 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)
 04/18/2023   20:40:07   (  -0.00,-104.73) (   0.00,-108.98)  473.16                 0
 04/19/2023   20:22:25   (  -0.00,-104.74) (   0.14,-104.25)   56.47                80
 04/22/2023   08:25:23   (   0.00,-104.75) (   0.04,-104.97)   24.28                80
 04/23/2023   08:03:57   (   0.00,-104.76) (  -0.98,-100.43)  493.44                80
 04/24/2023   20:25:50   (   0.00,-104.77) (  -0.19,-105.73)  108.64                80
 04/25/2023   20:09:43   (   0.00,-104.78) (   0.78,-101.18)  409.40                80
 04/27/2023   08:31:28   (   0.00,-104.79) (   0.35,-106.45)  188.75                80
 04/28/2023   08:10:00   (   0.01,-104.79) (  -0.63,-101.90)  329.33                80
 04/29/2023   20:31:54   (  -0.02,-104.80) (  -0.53,-107.20)  272.48                80
 04/30/2023   20:15:46   (  -0.02,-104.81) (   0.46,-102.65)  245.95                80
 05/02/2023   08:37:31   (   0.02,-104.83) (   0.72,-107.91)  351.27                80