Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/29/2021   22:06:02   (   0.14,-127.76) (   0.40,-126.47)  146.95                80
 07/31/2021   10:24:50   (  -0.16,-127.92) (   0.70,-131.66)  426.70                80
 08/01/2021   10:08:33   (  -0.15,-127.95) (  -0.35,-127.07)   99.85                80
 08/03/2021   22:11:11   (   0.17,-127.91) (   0.22,-127.69)   24.60                80
 08/06/2021   10:11:02   (  -0.18,-128.07) (  -0.16,-128.29)   24.89                80
 08/08/2021   22:13:38   (   0.20,-128.02) (  -0.02,-128.90)  101.42                80
 08/09/2021   21:57:21   (   0.19,-128.03) (   1.04,-124.32)  423.97                80
 08/11/2021   10:16:09   (  -0.21,-128.16) (   0.08,-129.50)  152.21                80