In English, 12 pm is typically referred to as “noon.” The term “pm” stands for “post meridiem,” which is Latin for “after midday.” In the 12-hour clock system, noon is the exact midpoint of the day, when the sun is at its highest point in the sky. In this article, we’ll delve deeper into the origins and uses of the term “noon,” as well as some related concepts in timekeeping.
Origins of the term “noon”
The word “noon” comes from the Old English term “non,” which meant “the ninth hour” of the day. This referred to the fact that in medieval times, people divided the daylight hours into 12 equal parts, starting at sunrise. Thus, the ninth hour was roughly equivalent to what we now call “noon.” Over time, the term “noon” came to be used specifically to refer to the midpoint of the day, regardless of the exact time of sunrise.
Uses of the term “noon”
The term “noon” is most commonly used to refer to 12 pm, the exact midpoint of the day. However, it can also be used more broadly to refer to the period of time around midday. For example, if someone says they’ll meet you “at noon,” they may actually mean sometime between 11 am and 1 pm.
In some cultures, noon has special significance. For example, in Islamic tradition, noon is the time of the midday prayer, which is one of the five daily prayers. In ancient Roman culture, noon was considered a time of rest and refreshment, known as “meridianus.” The term “meridian,” which refers to the line of longitude that passes through a particular location, comes from this same root.
Timekeeping concepts related to noon
In addition to “noon,” there are several other timekeeping concepts that are related to the midpoint of the day. Here are a few examples:
- The 24-hour clock system: In the 24-hour clock system, there is no need to distinguish between am and pm, since each hour is simply numbered from 0 to 23. Thus, 12 pm is simply 12:00, while 12 am is 00:00.
- Solar noon: Solar noon is the exact moment when the sun is at its highest point in the sky, as measured by a sundial or other device. This may not always coincide exactly with 12 pm, since the length of the day varies throughout the year.
- Daylight saving time: In many parts of the world, clocks are adjusted twice a year to account for changes in the amount of daylight. During daylight saving time, which typically begins in the spring and ends in the fall, clocks are set ahead by one hour. Thus, 12 pm during daylight saving time is actually 1 pm in standard time.
Conclusion
In conclusion, “noon” is the term commonly used in English to refer to 12 pm, the midpoint of the day. The word comes from the Old English term “non,” which meant “the ninth hour” of the day. In addition to “noon,” there are several other timekeeping concepts related to the midpoint of the day, such as solar noon and daylight saving time. By understanding these concepts, we can better appreciate the ways in which we measure and mark the passage of time.