Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 11 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 11/30/2021   22:58:45   (   0.01,-137.20) (  -0.42,-139.20)  226.84                80
 12/01/2021   22:43:02   (   0.00,-137.20) (   0.57,-134.75)  279.95                80
 12/03/2021   11:02:43   (  -0.00,-137.20) (   0.69,-140.13)  335.19                80
 12/04/2021   10:47:01   (   0.00,-137.19) (  -0.36,-135.70)  170.94                80
 12/05/2021   23:06:51   (  -0.00,-137.17) (  -0.90,-141.12)  450.25                80
 12/06/2021   22:51:09   (  -0.01,-137.16) (   0.09,-136.67)   55.40                80
 12/09/2021   10:52:28   (   0.01,-137.13) (   0.12,-137.62)   55.58                80
 12/10/2021   10:34:05   (   0.01,-137.12) (  -0.87,-133.17)  449.81                80
 12/11/2021   22:56:37   (  -0.00,-137.10) (  -0.32,-138.61)  171.92                80
 12/12/2021   22:40:54   (  -0.00,-137.08) (   0.67,-134.16)  333.44                80