Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 10 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/19/2020   10:32:51   (   0.03,-137.21) (  -0.49,-134.92)  261.17                80
 10/20/2020   22:51:49   (  -0.03,-137.19) (  -0.70,-140.14)  336.36                80
 10/21/2020   22:35:33   (  -0.03,-137.18) (   0.33,-135.56)  184.99                80
 10/23/2020   10:54:22   (   0.02,-137.17) (   0.80,-140.75)  407.20                80
 10/24/2020   10:38:05   (   0.02,-137.16) (  -0.23,-136.17)  113.93                80
 10/25/2020   22:57:04   (  -0.01,-137.14) (  -0.95,-141.39)  484.33                80
 10/26/2020   22:40:47   (  -0.01,-137.13) (   0.08,-136.81)   36.79                80
 10/29/2020   10:40:39   (   0.01,-137.10) (   0.09,-137.41)   35.01                80
 10/30/2020   10:24:23   (   0.01,-137.09) (  -0.94,-132.83)  485.70                80
 10/31/2020   22:43:21   (  -0.01,-137.06) (  -0.22,-138.05)  113.28                80
 11/01/2020   22:27:04   (  -0.01,-137.04) (   0.81,-133.47)  407.00                80