Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 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)
 03/20/2021   10:51:07   (  -0.04,-137.20) (   0.27,-138.56)  155.65                80
 03/21/2021   10:29:29   (  -0.04,-137.19) (  -0.75,-133.97)  366.29                80
 03/22/2021   22:51:06   (   0.04,-137.17) (  -0.39,-139.19)  229.78                80
 03/23/2021   22:34:49   (   0.03,-137.16) (   0.63,-134.61)  291.88                80
 03/25/2021   10:56:16   (  -0.02,-137.14) (   0.59,-139.77)  300.41                80
 03/26/2021   10:34:39   (  -0.02,-137.13) (  -0.43,-135.18)  220.80                80
 03/27/2021   22:56:15   (   0.02,-137.10) (  -0.75,-140.39)  376.38                80
 03/28/2021   22:39:59   (   0.02,-137.08) (   0.33,-135.82)  144.53                80
 03/30/2021   11:01:27   (  -0.02,-137.05) (   0.84,-141.00)  449.00                80
 03/31/2021   10:39:49   (  -0.02,-137.03) (  -0.18,-136.41)   71.32                80