Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 14.  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   10:19:16   (   0.03,-128.50) (   0.38,-129.99)  170.32                80
 06/15/2021   09:57:38   (   0.04,-128.49) (  -0.67,-125.41)  352.04                80
 06/16/2021   22:19:15   (  -0.04,-128.40) (  -0.52,-130.61)  252.36                80
 06/17/2021   22:02:56   (  -0.04,-128.39) (   0.46,-126.02)  270.11                80
 06/19/2021   10:21:44   (   0.03,-128.46) (   0.63,-131.21)  312.51                80
 06/20/2021   10:05:26   (   0.04,-128.45) (  -0.36,-126.61)  209.28                80
 06/21/2021   22:24:22   (  -0.02,-128.34) (  -0.83,-131.81)  396.95                80
 06/22/2021   22:08:05   (  -0.03,-128.32) (   0.21,-127.23)  124.52                80
 06/24/2021   10:26:52   (   0.01,-128.38) (   0.94,-132.40)  459.17                80
 06/25/2021   10:10:35   (   0.02,-128.36) (  -0.11,-127.82)   61.73                80
 06/27/2021   22:10:32   (  -0.02,-128.22) (  -0.09,-128.43)   24.94                80