Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/05/2021   10:18:10   (  -0.03,-128.16) (   0.43,-130.22)  235.06                80
 07/06/2021   10:01:52   (  -0.03,-128.13) (  -0.62,-125.64)  285.07                80
 07/07/2021   22:20:48   (   0.05,-128.00) (  -0.56,-130.85)  323.31                80
 07/08/2021   22:04:30   (   0.04,-127.97) (   0.43,-126.25)  196.62                80
 07/10/2021   10:23:17   (  -0.06,-128.00) (   0.71,-131.43)  390.20                80
 07/11/2021   10:06:59   (  -0.05,-127.97) (  -0.28,-126.83)  129.28                80
 07/12/2021   22:25:55   (   0.07,-127.83) (  -0.89,-132.04)  480.27                80
 07/13/2021   22:09:38   (   0.06,-127.79) (   0.16,-127.45)   39.26                80
 07/16/2021   10:09:26   (  -0.06,-127.78) (  -0.00,-128.03)   29.05                80
 07/17/2021   09:53:08   (  -0.05,-127.74) (  -0.99,-123.43)  489.83                80
 07/18/2021   22:12:04   (   0.07,-127.58) (  -0.16,-128.65)  120.87                80