Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 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)
 01/29/2021   09:55:56   (   0.35,-127.62) (  -0.04,-125.78)  209.26                80
 01/30/2021   22:20:13   (  -0.39,-127.62) (  -1.14,-131.00)  384.80                80
 01/31/2021   21:58:36   (  -0.37,-127.58) (  -0.13,-126.40)  133.48                80
 02/02/2021   10:22:43   (   0.40,-127.47) (   1.35,-131.57)  468.45                80
 02/03/2021   10:01:06   (   0.38,-127.43) (   0.28,-127.00)   49.40                80
 02/05/2021   22:06:26   (  -0.41,-127.37) (  -0.46,-127.62)   28.16                80
 02/06/2021   21:44:49   (  -0.39,-127.33) (   0.55,-123.03)  489.35                80
 02/08/2021   10:08:56   (   0.43,-127.21) (   0.66,-128.20)  113.83                80
 02/09/2021   09:47:20   (   0.41,-127.16) (  -0.40,-123.62)  403.31                80
 02/10/2021   22:11:36   (  -0.44,-127.14) (  -0.84,-128.83)  193.17                80
 02/11/2021   21:49:59   (  -0.43,-127.09) (   0.23,-124.25)  324.14                80