Contrails, Dark Lines, Black Beams, & “Chemtrails”
There are actually three main kinds of dark line related to contrails. 1. Self Shadow. Where the contrail itself is in shadow and appears dark. This can happen in a number of ways. The sun …
Here's What Causes These Stripes in the Sky at Sunset
2019年8月12日 · Stripes appeared in the sky at sunset in different parts of the United States over the weekend. They were caused by clouds blocking the trajectory of the sun's rays as the sun …
atmospheric optics - Explanation for contrail with a dark line
2022年8月5日 · Shadows in the atmosphere are pretty common. Light that is being scattered in the non-shadow area makes the atmosphere brighter, and the shadow (being shielded from …
What is a Shadow Stick? - sunship.currentsky.com
The shadow stick is any vertical, straight, object that casts a shadow. Shadow sticks can be telephone poles, a flagpole, or even a person standing. The shadow cast from a shadow stick …
Atmospheric Phenomena: Halos, Sundogs and Light Pillars
Parhelic circles are a rarer optical atmospheric phenomenon. They are white circular bands in the sky at the same level as the Sun or Moon. Generally, only parts of the circle can be seen at a …
Halo (optical phenomenon) - Wikipedia
A light pillar, or sun pillar, appears as a vertical pillar or column of light rising from the Sun near sunset or sunrise, though it can appear below the Sun, particularly if the observer is at a high …
2019年4月16日 · paperclip has no shadow because it is at the equator, where the Sun’s rays are directly overhead. The top paperclip has a shadow that points north because it is in the …
Sun Pillars: vertical shafts of light - University of Illinois Urbana ...
A sun pillar is a vertical shaft of light extending upward or downward from the sun. Typically seen during sunrise or sunset, sun pillars form when sunlight reflects off the surfaces of falling ice …
The pseudo-horizontal curved lines represent the influence of shadows created by overhangs characterized by horizontal edges parallel to the façade, and are drawn by calculating the …
The sun's apparent position on this 'sky vault' can be defined in terms of two angles (Fig.6): altitude (ALT) - measured in the vertical plane, between the sun's