STEP 12: LOCAL SIDEREAL TIME

ai



 
Element Symbol Value
Epoch to 05:54:21.171 UTC December 16, 2007
Inclination i 51o.9970
R.A. of the Ascending Node aW0 251o.0219
Eccentricity e 0.0001492
Argument of Perigee w0 33o.8641
Mean Anomaly at TLE Epoch Mo 326o.2322
Mean Motion n 12.62256095 orbits / solar day
Propagation Time Dt 1.7677141 solar days
Mean Anomaly at Time t M(t) 1.37777389 radians (78o.940629)
True Anomaly at Time t n(t) 78o.95065818
Semi-major Axis a 7791.787473 km
Perigee Distance P 7790.624938 km
Geocentric Distance r(t) 7791.564499 km
Precessed R.A. of Asc. Node aW(t) 245o.6400244
Precessed Arg. of Perigee w(t) 37o.77767416
Argument of Latitude m(t) 116o.7283323
R.A. Difference Da 129o.278845
Geocentric R.A. ag 14o.9188694
Geocentric Declination dg +44o.73125163
Geocentric Cartesian x xg 5348.663965 km
Geocentric Cartesian y yg 1425.05581 km
Geocentric Cartesian z zg 5483.565179 km
Observer Geodetic Longitude q -75o.6883
Observer Geodetic Latitude l +44o.5903
Observer Geocentric Dec. di +44o.5903


Next, we will require the Local Sidereal Time (ai) observed at the chosen location at Time t. You can determine this value with most planetarium software or using the Internet. When entering your longitude in any sidereal time calculators, be very careful of the convention used!

The Geocentric Right Ascension of the observing location is its Local Sidereal Time at Time t. In this example:

ai(t) = 15o.419875
 

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PROCEED TO STEP #13




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Step 12: Local Sidereal Time Was Last Modified On April 01, 2014