Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/02/2021   22:21:27   (  -0.00,-128.15) (  -0.39,-129.86)  195.36                80
 12/03/2021   22:05:44   (  -0.02,-128.12) (   0.60,-125.42)  309.00                80
 12/05/2021   10:25:25   (  -0.01,-128.07) (   0.59,-130.81)  311.65                80
 12/06/2021   10:09:42   (   0.01,-128.04) (  -0.34,-126.35)  192.13                80
 12/07/2021   22:29:33   (   0.02,-128.00) (  -0.86,-131.79)  432.33                80
 12/08/2021   22:13:51   (   0.01,-127.97) (   0.13,-127.34)   71.45                80
 12/11/2021   10:15:10   (  -0.02,-127.89) (   0.07,-128.29)   45.60                80
 12/12/2021   09:59:27   (  -0.01,-127.86) (  -0.93,-123.84)  458.04                80
 12/13/2021   22:19:17   (   0.03,-127.81) (  -0.32,-129.26)  166.50                80
 12/14/2021   22:03:35   (   0.02,-127.78) (   0.67,-124.82)  337.16                80