|U - V| - Distance between vector endpoints.|V| - Computes the magnitude of a vector.Satellite attitudes are usually indicated by a time tagged series of quaternions that can be used to show the difference between local satellite axis frame and the axis of an universal coordinate frame (ECF or ECI). In parallel with the satellite's position is the satellite's orientation, also known as attitude. The positions are 3D vectors in an Earth centered frame (ECF - Earth Centered Fixed or ECI - Earth Centered Inertial). Ephemeris is a time tagged list of orbital positions. TLEs are often used as input for orbit propagation algorithms that compute the ephemeris of orbiting bodies over time. Two-line element sets (TLE) are used as an encoded data format for orbital elements for objects in Earth orbit. If you pasted the second line into the input field of the TLE Checksum equation, you would get 7 as the resultant checksum. ![]() If you pasted the first line into the input field of the TLE Checksum equation, you would get 9 as the resultant checksum. The TLE Checksum equation then takes modulo 10 of the total of numeric values and the 1's for the minus signs.
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