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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/15/2021   22:23:01   (  -0.23,-128.15) (  -0.76,-130.59)  277.88                80
 10/16/2021   22:06:42   (  -0.24,-128.17) (   0.26,-125.99)  248.58                80
 10/18/2021   10:25:29   (   0.21,-128.23) (   0.89,-131.16)  334.96                80
 10/19/2021   10:09:10   (   0.23,-128.25) (  -0.13,-126.57)  191.47                80
 10/20/2021   22:28:06   (  -0.20,-128.27) (  -1.00,-131.78)  401.17                80
 10/21/2021   22:11:48   (  -0.21,-128.29) (   0.02,-127.19)  125.02                80
 10/23/2021   10:30:35   (   0.18,-128.34) (   1.07,-132.37)  459.29                80
 10/24/2021   10:14:17   (   0.20,-128.36) (   0.04,-127.78)   66.51                80
 10/26/2021   22:14:14   (  -0.19,-128.37) (  -0.20,-128.39)    2.67                80