Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/09/2021   10:14:08   (   0.05,-128.52) (   0.09,-128.79)   30.60                80
 06/10/2021   09:52:29   (   0.05,-128.51) (  -0.90,-124.19)  492.20                80
 06/11/2021   22:14:07   (  -0.04,-128.43) (  -0.23,-129.41)  111.01                80
 06/12/2021   21:57:48   (  -0.05,-128.43) (   0.75,-124.81)  411.81                80
 06/14/2021   10:19:15   (   0.04,-128.50) (   0.40,-129.99)  170.69                80
 06/15/2021   09:57:38   (   0.05,-128.49) (  -0.65,-125.40)  351.57                80
 06/16/2021   22:19:14   (  -0.04,-128.39) (  -0.54,-130.61)  253.03                80
 06/17/2021   22:02:57   (  -0.05,-128.38) (   0.50,-126.03)  269.33                80
 06/19/2021   10:21:44   (   0.04,-128.45) (   0.64,-131.20)  313.38                80
 06/20/2021   10:05:26   (   0.04,-128.44) (  -0.34,-126.60)  208.31                80
 06/21/2021   22:24:22   (  -0.03,-128.33) (  -0.84,-131.81)  398.09                80
 06/22/2021   22:08:04   (  -0.03,-128.31) (   0.21,-127.23)  123.28                80