Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/14/2021   10:04:04   (   0.26,-128.13) (  -0.34,-125.37)  314.53                80
 10/15/2021   22:23:00   (  -0.23,-128.15) (  -0.80,-130.58)  277.97                80
 10/16/2021   22:06:42   (  -0.24,-128.17) (   0.22,-125.99)  248.53                80
 10/18/2021   10:25:29   (   0.21,-128.23) (   0.88,-131.17)  334.88                80
 10/19/2021   10:09:11   (   0.23,-128.26) (  -0.14,-126.57)  191.58                80
 10/20/2021   22:28:07   (  -0.20,-128.27) (  -0.99,-131.79)  401.10                80
 10/21/2021   22:11:48   (  -0.21,-128.29) (   0.03,-127.19)  125.11                80
 10/23/2021   10:30:35   (   0.18,-128.34) (   1.12,-132.36)  459.08                80
 10/24/2021   10:14:17   (   0.20,-128.36) (   0.04,-127.78)   66.75                80
 10/26/2021   22:14:14   (  -0.19,-128.38) (  -0.21,-128.39)    2.86                80