Centaurus is a bright constellation in the southern sky.
Classical Cepheids (also known as Population I Cepheids, Type I Cepheids, or Delta Cephei variables) are a type of Cepheid variable star.
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant objects.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.