Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/14/2021   10:19:15   (   0.03,-128.50) (   0.39,-129.99)  170.42                80
 06/15/2021   09:57:38   (   0.04,-128.49) (  -0.65,-125.40)  351.92                80
 06/16/2021   22:19:14   (  -0.04,-128.40) (  -0.54,-130.61)  252.53                80
 06/17/2021   22:02:57   (  -0.04,-128.39) (   0.51,-126.03)  269.90                80
 06/19/2021   10:21:44   (   0.04,-128.46) (   0.64,-131.20)  312.74                80
 06/20/2021   10:05:26   (   0.04,-128.44) (  -0.35,-126.60)  209.02                80
 06/21/2021   22:24:23   (  -0.03,-128.33) (  -0.78,-131.83)  397.26                80
 06/22/2021   22:08:04   (  -0.03,-128.32) (   0.20,-127.23)  124.19                80
 06/24/2021   10:26:52   (   0.01,-128.38) (   0.94,-132.40)  459.56                80
 06/25/2021   10:10:34   (   0.02,-128.35) (  -0.10,-127.82)   61.31                80