Seasons and sky
Moonrise
Direct answer
Moonrise is the calculated instant when the Moon's upper limb appears at the observer's horizon under standard rise-and-set assumptions.
Moonrise is the local horizon time when the Moon begins to appear.
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At a glance
- Found in
- Seasons & Earth Almanac
- Related
- Astronomical Season, Meteorological Season, Equinox, Solstice
Moonrise is the local horizon time when the Moon begins to appear.
A Sun-Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.
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The story behind Moonrise
Lunar rise observations supported calendars, tides, night travel, religious practice, and practical illumination before electric light.
Why Moonrise matters
Moonrise changes substantially from day to day and helps explain when a lunar phase will actually be visible from a location.
How to read Moonrise
Moonrise with phase, date, coordinates, and time zone; account for days applies when the event falls outside the local calendar date.
Moonrise in practice: an example
A full Moon generally rises near sunset, while a waning crescent rises before dawn.
Where readings of Moonrise go wrong
A common error is to infer exact moonrise from phase alone or assume every location sees it at the same local time.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Rise, Set, and Twilight Definitions - Definitions used by USNO for sunrise, sunset, moonrise, moonset, and twilight.
- U.S. Naval Observatory: Complete Sun and Moon Data - Authoritative astronomical data services for positions, phases, and rise and set events.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Last updated
- 2026-09-26
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Common questions
What is moonrise?
Moonrise is the calculated instant when the Moon's upper limb appears at the observer's horizon under standard rise-and-set assumptions.
What do people get wrong about moonrise?
A common error is to infer exact moonrise from phase alone or assume every location sees it at the same local time.
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