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

BACK TO STEP #11

PROCEED TO STEP #13

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