Twilight refers to the period between the dawn and sunrise and between sunset and dusk. Sunset is the time when the last part of the Sun disappears below the horizon in the evening at a given location. Sunrise is the time when the first part of the Sun becomes visible in the morning at a given location. Respectively, dusk occurs when the Sun is 6° below the horizon in the evening. What are the definitions of dawn, dusk and twilight?ĭawn is the time of morning when the Sun is 6° below the horizon. Sunrise/sunset tables can be dynamically generated at these links: When do sunrise and sunset occur throughout the year? Another option would be to use 24-hour clock, using the designation of 0000 to refer to midnight at the beginning of a given day (or date) and 2400 to designate the end of a given day (or date). is a good idea, especially legal documents such as contracts and insurance policies. To avoid ambiguity, specification of an event as occurring on a particular day at 11:59 p.m. However, if a date/time is referred to as "at midnight on Friday, October 20th" the intention could be either midnight the beginning of the day or midnight at the end of the day. When someone refers to "midnight tonight" or "midnight last night" the reference of time is obvious. Is midnight the end of a day or the beginning of a day?
Hours of operation for a business or other references to a block of time should also follow this designation rule.įor example, a business might be open on Saturdays from 8 a.m. The same is true for midnight, but there is an added issue of which day midnight refers to (see below).
as soon as it the 12:00 appears, and not delay the display of the p.m. For example, it would be applicable for a digital clock changing from 11:59:59 a.m. It is fair to say, however, that the shortest measurable duration after noon should be designated as p.m. Also, midnight is both twelve hours before noon and twelve hours after noon. Since noon is neither before noon nor after noon, a designation of either a.m. To illustrate this, consider that "a.m." and "p.m." are abbreviations for "ante meridiem" and "post meridiem," which mean "before noon" and "after noon," respectively. This is a tricky question because 12 a.m. What are the definitions of dawn, dusk and twilight?Īre noon and midnight referred to as 12 a.m.
When do sunrise and sunset occur throughout the year?.Is midnight the end of a day or the beginning of a day?.Are noon and midnight referred to as 12 a.m.Sunrise/sunset times and definitions of dusk/dawn/twilight.
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