Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2021   10:18:55   (   0.36,-127.86) (   0.81,-129.75)  216.57                80
 09/23/2021   10:02:37   (   0.37,-127.82) (  -0.20,-125.15)  303.68                80
 09/24/2021   22:21:33   (  -0.35,-127.74) (  -0.91,-130.37)  299.78                80
 09/25/2021   22:05:14   (  -0.36,-127.70) (   0.10,-125.78)  219.93                80
 09/27/2021   10:24:02   (   0.33,-127.68) (   1.04,-130.95)  372.50                80
 09/28/2021   10:07:43   (   0.34,-127.64) (   0.03,-126.36)  146.95                80
 09/29/2021   22:26:38   (  -0.32,-127.55) (  -1.21,-131.56)  457.58                80
 09/30/2021   22:10:20   (  -0.32,-127.50) (  -0.20,-126.97)   61.31                80
 10/03/2021   10:10:09   (   0.31,-127.43) (   0.32,-127.55)   13.75                80