Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/06/2021   21:56:29   (  -0.31,-127.89) (   0.65,-123.58)  491.19                80
 10/08/2021   10:15:16   (   0.28,-127.96) (   0.46,-128.76)   91.23                80
 10/09/2021   09:58:58   (   0.30,-127.99) (  -0.55,-124.16)  435.80                80
 10/10/2021   22:17:54   (  -0.27,-128.01) (  -0.58,-129.38)  155.78                80
 10/11/2021   22:01:35   (  -0.28,-128.04) (   0.44,-124.79)  370.72                80
 10/13/2021   10:20:23   (   0.25,-128.10) (   0.66,-129.97)  213.16                80
 10/14/2021   10:04:04   (   0.26,-128.12) (  -0.36,-125.37)  313.12                80
 10/15/2021   22:23:01   (  -0.23,-128.14) (  -0.77,-130.59)  279.27                80
 10/16/2021   22:06:42   (  -0.24,-128.16) (   0.25,-126.00)  247.13                80
 10/18/2021   10:25:28   (   0.21,-128.22) (   0.91,-131.16)  336.69                80
 10/19/2021   10:09:11   (   0.23,-128.24) (  -0.17,-126.58)  189.73                80