The lines of longitude.
Spectra is most commonly referred to as the plural of spectrum. It is often used in the description of a band of colors such as those produced in a rainbow.
They're often referred to as "meridians" of longitude.
A group of fish is most commonly referred to as a school
They are most commonly referred to as "eraser shavings".
Yes, but they're most commonly referred to as "quarts".
It is commonly referred to as the flesh eating disease.
Rome is commonly referred to as the "Eternal City."
Meridians on a globe get closer and eventually merge at the North and South Poles. On a map (a flat plane) the meridians are drawn parallel and there is distortion at the poles, most noticeable on a world map.
Latitude is often referred to as parallels, and longitude is often called meridians.
Most fans call themselves Gleeks.
A group of kayaks are commonly referred to as a fleet, the same as most boats.
It is officially called "nisshouki," but most commonly referred to as "hinomaru."