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A two-line element set (TLE, or more rarely 2LE) or three-line element set (3LE) is a data format encoding a list of orbital elements of an Earth-orbiting object for a given point in time, the epoch. Using a suitable prediction formula, the state (position and velocity) at any point in the past or future can be estimated to some accuracy.
A three-letter acronym (TLA), or three-letter abbreviation, is as the phrase suggests an abbreviation consisting of three letters. The abbreviation for TLA, TLA, has a special status among abbreviations and to some is humorous since abbreviations that are three-letters long are very common and TLA is, in fact, a TLA. TLA is autological.
Orbital position vector, orbital velocity vector, other orbital elements. In astrodynamics and celestial dynamics, the orbital state vectors (sometimes state vectors) of an orbit are Cartesian vectors of position and velocity that together with their time () uniquely determine the trajectory of the orbiting body in space.
TLA: three letter acronym TLC: total lung capacity, or total lymphocyte count TLE: temporal lobe epilepsy: TLH: total laparoscopic hysterectomy TLR: tonic ...
TLA—Three-Letter Acronym; TLD—Top-Level Domain; TLS—Thread-Local Storage; TLS—Transport Layer Security; TLV—Type—length—value; tmp—temporary; TNC—Terminal Node Controller; TNC—Threaded Neill-Concelman connector; TPF—Transaction Processing Facility; TPM—Trusted Platform Module; TROFF—Trace Off; TRON—Trace On
However, TLA + specifications are written in a formal language of logic and mathematics, and the precision of specifications written in this language is intended to uncover design flaws before system implementation is underway. [6] Since TLA + specifications are written in a formal language, they are amenable to finite model checking.
For orbit propagation purposes, there is a field for BSTAR drag in two-line element set (TLE) files, where it is to be given in units of inverse Earth radii. [2] The corresponding reference air density is given as 0.15696615 kg / ( m 2 ⋅ R Earth ) {\displaystyle 0.15696615{\text{ kg}}/(\mathrm {m} ^{2}\cdot R_{\text{Earth}})} . [ 3 ]
PlusCal (formerly called +CAL) is a formal specification language created by Leslie Lamport, which transpiles to TLA +.In contrast to TLA + 's action-oriented focus on distributed systems, PlusCal most resembles an imperative programming language and is better-suited when specifying sequential algorithms. [1]