Parallax
Parallax
light beams are received from the sun.
B:See related question;
No. A light year measures such large distances that it would be highly impractical to measure anything on Earth. The light year is used to measure distance in space beyond the solar system.
light years
Laser
Light years are used to measure distance from Earth to distant stars and planets.
Light Year is unit for all astronomic distances
In spite of its name, a light year does not indicate time, but it indicates distance! It actually equates to the distance that light travels in one Earth year, which is a very big distance, seeing that light travels at 186,000 miles per second.
A "light year" is a measure of distance, derived from "how far light can travel in one Earth year". Thus, if you shine a torch for the amount of time it takes the Earth to orbit the sun exactly once, that light would have travelled the distance of a "light year".
The Earth gets its heat and light from the Sun. The Sun emits vast amounts of energy in the form of electromagnetic radiation, including heat and light, which reaches Earth through space. This energy is essential for supporting life on our planet.
Light years is a measure of distance, not of time; it is the distance that light travels in one year.