Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/03/2021   10:12:49   (   0.31,-127.78) (   0.27,-127.55)   25.69                80
 10/05/2021   22:12:47   (  -0.30,-127.85) (  -0.38,-128.17)   36.85                80
 10/06/2021   21:56:29   (  -0.31,-127.89) (   0.63,-123.58)  490.55                80
 10/08/2021   10:15:16   (   0.29,-127.95) (   0.48,-128.76)   92.27                80
 10/09/2021   09:58:57   (   0.30,-127.98) (  -0.54,-124.16)  434.60                80
 10/10/2021   22:17:54   (  -0.27,-128.00) (  -0.59,-129.38)  157.11                80
 10/11/2021   22:01:35   (  -0.28,-128.03) (   0.43,-124.79)  369.24                80
 10/13/2021   10:20:23   (   0.25,-128.08) (   0.68,-129.97)  215.05                80
 10/14/2021   10:04:04   (   0.26,-128.10) (  -0.34,-125.37)  311.06                80
 10/15/2021   22:23:00   (  -0.23,-128.12) (  -0.79,-130.59)  281.47                80
 10/16/2021   22:06:42   (  -0.24,-128.14) (   0.23,-125.99)  244.76                80