Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/19/2021   22:16:26   (  -0.37,-127.89) (  -0.65,-129.17)  146.22                80
 09/20/2021   22:00:08   (  -0.38,-127.86) (   0.36,-124.58)  374.06                80
 09/22/2021   10:18:55   (   0.36,-127.86) (   0.79,-129.76)  216.28                80
 09/23/2021   10:02:37   (   0.37,-127.83) (  -0.22,-125.16)  304.03                80
 09/24/2021   22:21:32   (  -0.35,-127.74) (  -0.95,-130.37)  299.76                80
 09/25/2021   22:05:14   (  -0.36,-127.70) (   0.06,-125.77)  220.00                80
 09/27/2021   10:24:01   (   0.33,-127.69) (   1.08,-130.95)  371.82                80
 09/28/2021   10:07:42   (   0.34,-127.65) (   0.07,-126.35)  147.69                80
 09/29/2021   22:26:38   (  -0.32,-127.55) (  -1.24,-131.56)  457.14                80
 09/30/2021   22:10:19   (  -0.32,-127.51) (  -0.22,-126.96)   61.87                80