ring articles
What is the scientific name for the luminous ring encircling the moon?
What atmospheric components generate the 22° halo?
In what types of high-altitude clouds are the necessary ice crystals usually found?
By approximately what angle do hexagonal ice crystals refract moonlight to form the standard halo?
In a well-formed 22° halo, which color appears on the edge closest to the moon?
The presence of cirrus clouds preceding a 22° halo is often the first indicator of what meteorological system?
According to the text, what is the relationship between the halo and an approaching storm?
How many pinky-finger widths (held at arm's length) span the diameter of a standard 22° halo from bottom to top?
What caution is necessary when attempting to observe a solar halo?
What is the angle associated with the rarer halo mentioned, which appears much further out from the sun or moon?