Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 19.  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)
 04/19/2023   20:22:25   (  -0.00,-104.73) (   0.09,-104.24)   56.01                80
 04/22/2023   08:25:23   (   0.00,-104.75) (   0.03,-104.97)   24.91                80
 04/23/2023   08:03:57   (   0.00,-104.75) (  -0.99,-100.43)  492.81                80
 04/24/2023   20:25:49   (   0.00,-104.76) (  -0.24,-105.72)  109.45                80
 04/25/2023   20:09:43   (   0.00,-104.77) (   0.79,-101.18)  408.51                80
 04/27/2023   08:31:27   (  -0.00,-104.78) (   0.39,-106.44)  189.75                80
 04/28/2023   08:10:01   (   0.00,-104.78) (  -0.64,-101.90)  328.17                80
 04/29/2023   20:31:53   (  -0.01,-104.79) (  -0.57,-107.19)  273.80                80
 04/30/2023   20:15:46   (  -0.01,-104.80) (   0.47,-102.66)  244.55                80
 05/02/2023   08:37:31   (   0.01,-104.82) (   0.70,-107.92)  352.76                80
 05/03/2023   08:16:04   (   0.00,-104.83) (  -0.35,-103.38)  165.27                80