Simultaneous Nadir Overpasses (SNOs) between NOAA-20 and NOAA-19
TLE Epoch: 2017 12 21.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-20) NOAA-20 Lat/Lon Date Time(NOAA-19) NOAA-19 Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2017   22:25:09   ( -80.71, -23.63) 12/21/2017   22:24:00  ( -80.71, -23.65)    0.40                69
 12/21/2017   23:15:52   (  80.71, 143.61) 12/21/2017   23:15:02  (  80.70, 143.48)    2.75                50
 12/22/2017   00:06:35   ( -80.71, -49.05) 12/22/2017   00:06:01  ( -80.71, -49.02)    0.57                34
 12/22/2017   00:57:18   (  80.72, 118.19) 12/22/2017   00:57:03  (  80.71, 118.10)    2.06                15
 12/22/2017   01:48:01   ( -80.72, -74.47) 12/22/2017   01:48:02  ( -80.72, -74.39)    1.39                 1
 12/22/2017   02:38:44   (  80.72,  92.77) 12/22/2017   02:39:04  (  80.71,  92.72)    1.44                20
 12/22/2017   03:29:27   ( -80.72, -99.89) 12/22/2017   03:30:03  ( -80.72, -99.77)    2.23                36
 12/22/2017   04:20:10   (  80.73,  67.35) 12/22/2017   04:21:05  (  80.72,  67.34)    1.04                55
 12/22/2017   05:10:53   ( -80.72,-125.31) 12/22/2017   05:12:04  ( -80.72,-125.14)    3.08                71
 01/03/2018   01:11:05   ( -80.72, -65.30) 01/03/2018   01:09:50  ( -80.67, -65.72)    9.25                75
 01/03/2018   02:01:46   (  80.69, 102.52) 01/03/2018   02:00:46  (  80.70, 102.35)    3.23                60
 01/03/2018   02:52:30   ( -80.70, -90.38) 01/03/2018   02:51:49  ( -80.70, -90.38)    0.19                41
 01/03/2018   03:43:12   (  80.69,  77.10) 01/03/2018   03:42:47  (  80.70,  76.97)    2.65                25
 01/03/2018   04:33:56   ( -80.71,-115.80) 01/03/2018   04:33:50  ( -80.71,-115.76)    0.68                 6
 01/03/2018   05:24:38   (  80.70,  51.68) 01/03/2018   05:24:48  (  80.71,  51.59)    2.13                10
 01/03/2018   06:15:22   ( -80.71,-141.21) 01/03/2018   06:15:51  ( -80.71,-141.14)    1.42                29
 01/03/2018   07:06:04   (  80.70,  26.26) 01/03/2018   07:06:49  (  80.71,  26.21)    1.71                45