👉 Phototachometrical is a concept in the field of astronomy and space exploration, which refers to the process by which stars are observed through telescopes. It involves using a telescope or other optical instrument to observe a star from a distance, such as from Earth, while it is still emitting light. The phototachometrical method allows astronomers to study the properties of stars at very low magnitudes (less than 20) and can provide important information about the structure and evolution of the
