Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 1 27.  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)
 01/29/2023   09:20:52   (   0.01,-117.21) (   0.47,-119.24)  232.21                80
 01/30/2023   09:04:43   (   0.01,-116.05) (  -0.31,-114.66)  158.85                80
 02/01/2023   21:05:01   (  -0.02,-113.13) (  -0.50,-115.29)  245.98                80
 02/02/2023   20:48:52   (  -0.02,-111.97) (   0.29,-110.70)  144.97                80
 02/05/2023   08:49:02   (   0.02,-109.04) (   0.52,-111.30)  256.95                80
 02/06/2023   08:32:51   (   0.02,-107.88) (  -0.21,-106.70)  134.03                80
 02/08/2023   20:33:10   (  -0.02,-104.96) (  -0.56,-107.34)  270.71                80
 02/09/2023   20:17:01   (  -0.02,-103.81) (   0.24,-102.75)  120.44                80