Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/13/2021   22:19:18   (   0.03,-127.80) (  -0.33,-129.26)  167.06                80
 12/14/2021   22:03:35   (   0.02,-127.77) (   0.67,-124.81)  336.30                80
 12/16/2021   10:23:17   (  -0.04,-127.70) (   0.53,-130.21)  285.50                80
 12/17/2021   10:07:34   (  -0.02,-127.66) (  -0.47,-125.76)  217.28                80
 12/18/2021   22:27:24   (   0.04,-127.60) (  -0.78,-131.19)  408.68                80
 12/19/2021   22:11:42   (   0.03,-127.56) (   0.21,-126.74)   93.88                80
 12/22/2021   10:13:01   (  -0.03,-127.45) (  -0.01,-127.69)   26.81                80
 12/23/2021   09:57:17   (  -0.03,-127.40) (  -0.95,-123.23)  475.29                80
 12/24/2021   22:17:09   (   0.04,-127.33) (  -0.23,-128.66)  151.80                80
 12/25/2021   22:01:25   (   0.04,-127.28) (   0.71,-124.21)  350.15                80