Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/16/2021   22:10:00   (  -0.06,-128.14) (   0.00,-127.94)   23.60                80
 05/19/2021   10:12:30   (   0.07,-128.27) (   0.16,-128.52)   30.07                80
 05/20/2021   09:50:52   (   0.07,-128.29) (  -0.88,-123.94)  495.07                80
 05/21/2021   22:12:29   (  -0.07,-128.25) (  -0.28,-129.15)  103.06                80
 05/22/2021   21:56:11   (  -0.07,-128.27) (   0.75,-124.56)  422.16                80
 05/24/2021   10:17:39   (   0.07,-128.37) (   0.38,-129.75)  157.16                80
 05/25/2021   09:56:02   (   0.07,-128.38) (  -0.66,-125.16)  367.05                80
 05/26/2021   22:17:38   (  -0.07,-128.32) (  -0.51,-130.37)  233.30                80
 05/27/2021   22:01:21   (  -0.07,-128.33) (   0.53,-125.78)  290.99                80
 05/29/2021   10:22:48   (   0.07,-128.43) (   0.65,-130.95)  288.84                80
 05/30/2021   10:01:11   (   0.07,-128.43) (  -0.38,-126.37)  234.84                80