Kneel for the space of the twelve constellations (to be true)

There are 88 known constellations at present.

Divided into north constellation and south constellation.

Among them, the longest

The largest constellation is Ophiuchus.

The smallest is the Southern Cross.

Most constellations use animals.

And the names of mythical characters.

There are many constellations in the south than in the north.

The sky is also much brighter than the north.

There are abundant nebulae and clusters in the southern sky.

It contains two Magellanic clouds, the big one and the small one.

These are the two closest galaxies to our galaxy.

Constellation is a group of obvious stars.

The distance between the stars in the constellation may be very different.

Due to the relative motion between stars

For thousands of years, the shapes of constellations may change.

The movement of constellations in the sky is caused by the movement of the earth in space.

The rotation of the earth causes constellations to cross the sky from east to west.

The earth's orbit around the sun makes it possible to observe different areas of the sky in different seasons.

Visibility of different areas in the sky is also related to the position of the observer.

take for example

A star near the equator of the celestial sphere.

Sometime in a year.

You can see it from both hemispheres.

Stars close to the celestial pole can never be observed from the opposite hemisphere.