Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 10.  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,-131.97)  432.06                80
 09/12/2021   10:11:23   (   0.41,-128.15) (   0.23,-127.37)   88.90                80
 09/14/2021   22:14:00   (  -0.40,-128.03) (  -0.39,-127.98)    5.67                80
 09/17/2021   10:13:50   (   0.38,-128.01) (   0.48,-128.57)   63.65                80
 09/18/2021   09:57:31   (   0.39,-127.98) (  -0.52,-123.98)  456.82                80
 09/19/2021   22:16:27   (  -0.37,-127.89) (  -0.64,-129.18)  147.09                80
 09/20/2021   22:00:08   (  -0.38,-127.86) (   0.37,-124.59)  373.25                80
 09/22/2021   10:18:56   (   0.36,-127.86) (   0.79,-129.76)  216.58                80
 09/23/2021   10:02:37   (   0.37,-127.83) (  -0.22,-125.17)  303.83                80