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, -ray Geometric Optics = Orbital Motion of Photo

ns 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