The difference between a.m. and p.m. is in the time of day. The designation a.m. refers to any time that is after midnight and prior to noon. Any time that is between noon and midnight is designated p.m.Know More
The designation a.m., which is short for ante meridiem in Latin, means "before the sun passes the meridian." An example of a.m. usage is 10:00 a.m. The designation p.m. is short for post meridiem in Latin. An example of p.m. usage is 3:00 p.m. Noon refers to 12:00 p.m., and midnight refers to 12:00 a.m.
The U.S. Army uses a 24-hour format to indicate time rather than a 12-hour format, so a.m. and p.m. are not needed.Learn more about Time & Calendars
The types of calendars used by societies have varied throughout history. According to the education website EDinformatics, lunar calendars are synchronized to the phases of the moon, whereas solar calendars are linked to the perceived movement of the sun causing the changes of the seasons. Lunisolar calendars are linked to both the movement of the moon and the apparent movement of the sun.Full Answer >
The United States and other areas observing both standard and daylight savings time turn the clocks back on the first Sunday of November at 2:00 a.m. Prior to 2007, the change traditionally took place on the last Sunday of October at 2:00 a.m.Full Answer >
Sep. 11, 2001, was a Tuesday. On that day, which is often referred to as 9/11, four planes were hijacked by terrorists to carry out suicide attacks against U.S. targets.Full Answer >
Science is extremely important in everyday life because there is not one aspect of daily living that science has not made easier, faster or safer. Science results in technology that people rely on for health, communication and transportation. Scientific knowledge helps people understand the world from a cellular to a universal level.Full Answer >