What is Astrometry? Definition: To study the universe through positions and motions of celestial objects Acronym: Fund./Classical/Positional Astr. Related.

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Presentation transcript:

What is Astrometry? Definition: To study the universe through positions and motions of celestial objects Acronym: Fund./Classical/Positional Astr. Related Science: Cele. Mech. & Dyn. Astr. Geodesy & Geophysics Special & General Relativity

Principles 4-dim. Continuous Spacetime Rule of Causality Time Arrow Definiteness Principle of Determinacy Existence of Inertial Frame Principles of Relativity

Elements Observation & Measurement Time Space Reference Frame Motion Rotation Signal Propagation

Reference System Time and Space Coordinate Systems Time Systems Astronomical, Physical, Broadcasting Reference Frames = Spatial Coord. System Unit Systems

Motion Cosmic Expansion Quasi-Linear Motions of Distant Objects Stars, Galaxies, Quasars Orbital Motions Binaries, Planets, Satellites, Comets, Vehicles Rotational Motions Earth, Moon, Satellites

Signal Propagation Electromagnetic Wave Optical, IR, Radio, X-ray, g -ray Geometric Optics = Orbital Motion of Photons Relativistic Treatments Cosmic Rays (= Heavy Particles) Gravitational Wave?

Measurement Time Arrival Time, Event Time, Shooting Time Incoming Direction Energy = Wavelength Pattern: Pulse Profile, Pulse Train, Wave Pattern Contained Codes

Mathematical Tools Rotational Matrices Solution of Non-Linear Eq. Method of Least Squares Integration of Eq. of Motion Fourier Analysis