Question

Explain why lines of longitude are called meridians of longitude

Answer 1

The term "meridian" comes from the Latin meridies, meaning "midday"; the sun crosses a given meridian midway between the times of sunrise and sunset on that meridian. The same Latin stem gives rise to the terms a.m. (ante meridiem) and p.m. (post meridiem)used to disambiguate hours of the day when utilizing the 12-hour clock.