Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/10/2021   22:21:08   (  -0.06,-127.98) (  -0.79,-131.31)  379.42                80
 05/11/2021   22:04:50   (  -0.06,-128.01) (   0.24,-126.72)  147.10                80
 05/13/2021   10:26:19   (   0.06,-128.12) (   0.90,-131.91)  431.35                80
 05/14/2021   10:04:41   (   0.05,-128.14) (  -0.14,-127.32)   94.14                80
 05/16/2021   22:09:59   (  -0.06,-128.14) (  -0.04,-127.93)   23.35                80
 05/19/2021   10:12:30   (   0.06,-128.27) (   0.14,-128.53)   30.49                80
 05/20/2021   09:50:52   (   0.06,-128.28) (  -0.90,-123.94)  494.43                80
 05/21/2021   22:12:29   (  -0.07,-128.24) (  -0.25,-129.16)  103.70                80
 05/22/2021   21:56:11   (  -0.06,-128.26) (   0.79,-124.57)  421.45                80