fotometreid

Fotometreid is a concept in Estonian astronomy, which translates to "photometer units". It is a system of measurement used to quantify the brightness of celestial objects such as stars and galaxies. The measurement is based on the amount of light received from an object, usually expressed in units of a reference object.

The fotometreid system was developed in the 20th century by Estonian astronomers to provide a more intuitive way of understanding the brightness of distant celestial objects. It was designed to be based on the human visual perception of brightness, with the assumption that a reference object with a given brightness would be perceived as having a certain amount of light in a specific area.

The fotometreid system is calculated using a specific formula, which takes into account the luminosity class of the object and its distance from Earth. The result is a value that represents the perceived brightness of the object as seen from Earth.

Fotometreid is still used today in astronomy and astrophysics, particularly in the study of variable stars, which is the branch of astronomy that deals with the study of stars that change in brightness. The system provides an alternative method of measuring brightness, which can be useful when the traditional photometric system is difficult to apply.

Despite its limited international use, the fotometreid system has contributed to the understanding of astronomy and has facilitated the development of new techniques for measuring the brightness of celestial objects.