Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/22/2021   10:50:08   (   0.03,-137.18) (   0.08,-137.42)   26.64                80
 10/23/2021   10:33:49   (   0.03,-137.17) (  -0.95,-132.82)  495.99                80
 10/24/2021   22:52:45   (  -0.03,-137.16) (  -0.24,-138.03)   99.72                80
 10/25/2021   22:36:26   (  -0.03,-137.14) (   0.78,-133.43)  422.46                80
 10/27/2021   10:55:13   (   0.02,-137.12) (   0.36,-138.60)  168.77                80
 10/28/2021   10:38:54   (   0.02,-137.11) (  -0.67,-134.01)  352.89                80
 10/29/2021   22:57:49   (  -0.01,-137.08) (  -0.51,-139.21)  244.17                80
 10/30/2021   22:41:31   (  -0.01,-137.06) (   0.52,-134.62)  277.29                80
 11/01/2021   11:00:17   (   0.01,-137.03) (   0.63,-139.79)  314.76                80
 11/02/2021   10:43:59   (   0.01,-137.01) (  -0.40,-135.20)  206.36                80