What is the astronomical phenomenon in transit of venus?

A series of interesting optical phenomena will occur when Venus enters and exits the sun's surface, which is worth observing. Transit of venus, this is one of the events in astrophotography.

When Venus enters and exits Lingling, careful observers may find the so-called "black drop" phenomenon. In fact, when we face the light, we will gradually get closer to the two fingers. When we get close together, we can see that although the fingers are not touching, we can see a shadow between the upper and lower fingers to connect them, and the fingers stick together like water drops. This is the so-called "black drop" phenomenon. When the inner edge of the sun is close to the inner planet and will touch each other, it will be found that there are very thin wires connecting the two edges, which is the phenomenon of black drops during the transit.

In addition, in the entry and exit stages, sometimes the edge of Venus' visual plane will be inlaid with a tiny halo or halo. This "halo" is formed by the reflection and scattering of sunlight at the top of Venus' atmosphere. You can see it through the eyepiece projection, but it will be clearer if you add a filter to the telescope.

No matter what happens in transit of venus, people are looking forward to it. These phenomena also make many people feel very interesting, so study them carefully. Many scientists have studied various phenomena in transit of venus in history.