When is Venus Day?

Venus will not reach its maximum brightness until sunrise or sunset.

The rendezvous period between Venus and the Earth is 584 days. For example, at a certain moment, the sun, Venus and the earth are "in a straight line", then the next three-star line will appear after 584 days, and there is no strict correspondence with the four seasons.

It appears in the eastern sky in the morning and is called "Qi Ming". It is in the west of the evening sky and is called Chang Geng.

Taking the earth as one of the vertices of the triangle, connecting Venus and the sun respectively, we will find that this angle is very small, even if the maximum is only 48.5, because Venus's orbit is inside the earth's orbit.

So when we see Venus, it is either in the morning or at night, on the east and west sides of the sky respectively.

Extended data:

Venus' unique astronomical wonder "transit";

Because mercury and venus are "inner planets" in the orbit of the earth around the sun. Therefore, when Venus moves between the sun and the earth, we can see a small black dot passing slowly on the surface of the sun. This astronomical phenomenon is called "transit of venus".

In astronomy, the two transit of venus phenomena with the shortest time interval are often grouped together. The regularity of this phenomenon is usually 8 years,1210.5 years, 8 years, 105.5 years, and so on. According to the astronomers' calculation, the time of this group of transit of venus is June 8, 2004 and June 6, 20 12, respectively.

This is mainly because Venus orbits the sun 13 times, just close to the earth that orbits the sun for 8 times, between the earth and the sun, which is equivalent to 8 years on the earth.

Although transit of venus said that he might be able to see with the naked eye, the effect would not be very good. If you have a telescope, whether it is a small observation telescope or an astronomical telescope, you can get better results.

The circular outline of Venus can be clearly seen at the magnification above 10, and the best observation magnification is about 40- 100. If the weather is clear, you can also see the aperture reflected by Venus' thick atmosphere, and the scene is still spectacular. If there are more sunspots on the surface of the sun, Venus may hide them, which makes the transit more interesting.

In most parts of China, transits mostly start around 13. So friends who want to observe should be ready before noon.