How is the brightness of the stars expressed?

Look at the stars all over the sky

You can find that some stars are brighter.

Some stars are dark. How to calculate the brightness of a star? Astronomers use grading methods to distinguish the brightness of stars.

We can often see 1 and so on in the horoscope.

Second class, and so on, and so on. This distinguishing method was invented by Greek astronomer Baccus, who divided the stars visible to the naked eye into six grades.

Then give it to the stars one by one.

It is divided into 1 to 6 levels. With the progress of science,

In later studies, it was found that

1 star is brighter than 6 stars 100 times.

in other words

Every other order of magnitude

The brightness difference of stars is 2.5 times. For example, the amount of light of a third-class star.

It is 2.5 times that of four stars.

Or 6.25 times that of a five-star star. Later, in order to express the brightness of stars more accurately, scientists

A decimal point was added to the quantity.

Used to distinguish two stars with similar grades. For example, the brightness of Vega is 0.

The brightness of Capella is 0. 1, and so on.

You can see that Vega is brighter.

Reference: web.mit.edu/yenjielm/Space/mercury-title