Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/01/2021   10:01:35   (   0.03,-128.18) (  -0.81,-124.43)  427.41                80
 12/02/2021   22:21:27   (  -0.00,-128.15) (  -0.40,-129.86)  195.49                80
 12/03/2021   22:05:44   (  -0.02,-128.12) (   0.59,-125.41)  308.82                80
 12/05/2021   10:25:25   (  -0.01,-128.07) (   0.60,-130.81)  311.94                80
 12/06/2021   10:09:43   (   0.01,-128.04) (  -0.39,-126.36)  191.76                80
 12/07/2021   22:29:34   (   0.02,-128.00) (  -0.82,-131.80)  432.75                80
 12/08/2021   22:13:51   (   0.01,-127.97) (   0.12,-127.34)   71.02                80
 12/11/2021   10:15:10   (  -0.02,-127.88) (   0.08,-128.28)   46.26                80
 12/12/2021   09:59:27   (  -0.01,-127.85) (  -0.91,-123.84)  457.33                80
 12/13/2021   22:19:18   (   0.03,-127.80) (  -0.28,-129.27)  167.27                80
 12/14/2021   22:03:36   (   0.02,-127.77) (   0.71,-124.83)  336.32                80