POLARIS (Alpha Ursae Minoris). Not seasonal, always there in the northern nighttime sky, Polaris, the North Star, marks the North Celestial Pole. For those in the northern hemisphere it is a
navigator's benchmark, the elevation above the horizon closely equal to the observer's latitude.
GGP --The GG Polaris - the navigator's benchmark variable Star
A Cepheid
Variable Star
Polaris is a pulsating
variable star of a type known as a Cepheid variable, after prototypical star of this type, Delta Cephei. Cepheid variables are bright, giant stars that show periodic variations in luminosity. In general, the longer the period, the brighter the star. This correlation allows the luminosity (absolute magnitude) to be inferred from the period