2021-03-20

Do we share the same starry sky with the ancients?

By yqqlm yqqlm

Source:Yuncheng News Net

Throughout the ages, the bright starry sky has always evoked the inquiries and curiosity of countless people, and entrusted people’s thousands of emotions. So, in a different time and space, do people see the same starry sky as the ancients?

In this regard, astronomers’ point of view is:the position of stars in the sky has been changing, but the changes are very slow, and the changes in thousands of years are almost negligible. The stars visible to our naked eyes include the sun, the moon and the five planets of the solar system-Mercury, Venus, Mars, Jupiter, Saturn. They move faster, so when viewed from the earth, their position is always changing. In addition, the relative positions of those stars and galaxies that are very far away from the earth are almost fixed in our view.

But are they really fixed? Of course not, but in the short term, it is basically the same as the ancient starry sky. But if the time scale is enlarged to thousands or even tens of thousands of years, small changes will be found. This is mainly caused by the irregularity of the earth’s movement, commonly known as”precession”, which is the long-term movement of the earth’s rotation axis. Precession can cause the position of the same star to change over time, which is the result of the combination of the earth’s revolution and the motion of the earth’s axis. Another reason is the self-propelled star. The self-propelled star refers to the angle of the observer from the distance the star travels on the sky in a year. The speed of the stars themselves is generally very small, and the speed of many stars is less than 1 arc second per year, which will cause the illusion of almost no movement. Therefore, when looking up at the starry sky, we only see the Milky Way with the naked eye and what the ancients saw thousands of years ago is not too big. difference. Through the long time, we shared this vast starry sky with the ancients. (“Shanxi Women’s Daily”)