Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/11/2021   10:27:42   (   0.41,-128.17) (   1.24,-131.96)  431.89                80
 09/12/2021   10:11:23   (   0.41,-128.15) (   0.24,-127.37)   89.12                80
 09/14/2021   22:11:20   (  -0.40,-128.03) (  -0.40,-127.98)    6.09                80
 09/17/2021   10:13:50   (   0.38,-128.01) (   0.49,-128.57)   63.06                80
 09/18/2021   09:57:31   (   0.39,-127.99) (  -0.51,-123.97)  457.43                80
 09/19/2021   22:16:27   (  -0.37,-127.89) (  -0.65,-129.18)  146.43                80
 09/20/2021   22:00:08   (  -0.38,-127.87) (   0.36,-124.58)  373.95                80
 09/22/2021   10:18:56   (   0.36,-127.87) (   0.80,-129.76)  215.71                80
 09/23/2021   10:02:37   (   0.37,-127.84) (  -0.21,-125.16)  304.77                80
 09/24/2021   22:21:32   (  -0.35,-127.75) (  -0.96,-130.37)  299.29                80