Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/05/2021   10:25:25   (  -0.01,-128.07) (   0.61,-130.81)  311.53                80
 12/06/2021   10:09:43   (   0.01,-128.04) (  -0.39,-126.36)  192.28                80
 12/07/2021   22:29:34   (   0.02,-128.00) (  -0.82,-131.79)  431.93                80
 12/08/2021   22:13:52   (   0.01,-127.97) (   0.17,-127.35)   71.92                80
 12/11/2021   10:15:09   (  -0.02,-127.89) (   0.09,-128.28)   45.18                80
 12/12/2021   09:59:27   (  -0.01,-127.86) (  -0.91,-123.84)  458.56                80
 12/13/2021   22:19:18   (   0.03,-127.82) (  -0.29,-129.27)  165.73                80
 12/14/2021   22:03:36   (   0.02,-127.78) (   0.71,-124.83)  337.95                80
 12/16/2021   10:23:16   (  -0.04,-127.73) (   0.54,-130.21)  283.18                80
 12/17/2021   10:07:34   (  -0.03,-127.69) (  -0.45,-125.76)  219.99                80