Monday

Monday is the day of the week between Sunday and Tuesday. Its English name comes from Old English mōnandæg, meaning “Moon’s day.”

Old English: The earliest recorded form of the English language, spoken in England from roughly the fifth to the eleventh centuries. Mōnandæg, the source of Monday, is an Old English compound meaning “Moon’s day.”
Seven-day week: A repeating cycle of seven days used to organize calendars and social time. Monday is one position in this repeating cycle.
Gregorian calendar: The solar calendar introduced by Pope Gregory XIII in 1582 and now used internationally for civil dates. Gregorian dates identify Monday as a recurring weekday without making it the calendar’s first day.
Sunday-start week: A calendar convention that displays Sunday as the first day of the week. It contrasts with ISO calendars, which place Monday first.
Lunar week: A cycle that divides time into seven-day periods associated with the phases or observation of the Moon. Monday’s name connects the weekday to the Moon, though the modern week is not synchronized with lunar phases.
Sunday: The day of the week between Saturday and Monday in the standard seven-day week. Sunday immediately precedes Monday in the weekly sequence.
ISO week date: A date notation that assigns each date a week number and weekday, with Monday as day one. This system gives Monday a formal first-day role in numbered weeks.
Monday-start week: A calendar convention that displays Monday as the first day of the week. This convention matches Monday’s role as the first day in ISO week numbering.
Planetary week: A seven-day cycle whose days are associated with the Sun, Moon, and five classical planets. Monday belongs to the planetary weekday sequence and retains its lunar association.
Tuesday: The day of the week between Monday and Wednesday in the standard seven-day week. Tuesday immediately follows Monday in the weekly sequence.

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