Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 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)
 06/16/2021   22:19:14   (  -0.03,-128.40) (  -0.55,-130.61)  252.06                80
 06/17/2021   22:02:56   (  -0.04,-128.39) (   0.49,-126.02)  270.52                80
 06/19/2021   10:21:44   (   0.03,-128.46) (   0.65,-131.20)  311.89                80
 06/20/2021   10:05:26   (   0.04,-128.45) (  -0.40,-126.61)  210.01                80
 06/21/2021   22:24:23   (  -0.02,-128.34) (  -0.79,-131.82)  396.06                80
 06/22/2021   22:08:04   (  -0.03,-128.33) (   0.20,-127.22)  125.56                80
 06/24/2021   10:26:51   (   0.01,-128.39) (   0.94,-132.40)  457.95                80
 06/25/2021   10:10:34   (   0.02,-128.37) (  -0.10,-127.81)   63.08                80
 06/27/2021   22:10:33   (  -0.01,-128.23) (  -0.03,-128.44)   23.33                80
 06/28/2021   21:54:14   (  -0.02,-128.21) (   0.96,-123.84)  498.18                80