Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 4 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  METOP-B Lat/Lon    Distance(km)  Time Diff(sec)
 04/20/2021   18:07:45   (   0.08,-127.88) (   0.46,-129.69)  206.48                80
 04/21/2021   17:49:45   (   0.08,-127.84) (  -0.62,-124.69)  359.14                80
 04/23/2021   06:08:44   (  -0.07,-127.70) (  -0.40,-129.28)  179.90                80
 04/24/2021   05:45:24   (  -0.08,-127.66) (   0.69,-124.28)  385.12                80
 04/25/2021   18:04:14   (   0.07,-127.68) (   0.35,-128.84)  132.30                80
 04/26/2021   17:46:14   (   0.08,-127.64) (  -0.74,-123.84)  432.85                80
 04/28/2021   06:05:13   (  -0.07,-127.50) (  -0.29,-128.43)  106.81                80
 04/29/2021   05:41:52   (  -0.07,-127.45) (   0.80,-123.43)  457.29                80
 04/30/2021   18:00:44   (   0.06,-127.45) (   0.17,-128.00)   62.03                80
 05/03/2021   06:01:43   (  -0.06,-127.25) (  -0.11,-127.59)   38.01                80