Termine del Glossario Fase lunare
Descrizione La forma mutevole della parte visibile della Luna illuminata dal Sole è conosciuta come fase lunare. Metà della Luna è sempre illuminata dal Sole, tranne durante le eclissi lunari. Sulla Terra vediamo diverse parti della Luna illuminate mentre si muove nella sua orbita intorno a noi. Il mese lunare inizia e finisce nella stessa fase. Ad esempio, se partiamo da una luna nuova, a causa della rivoluzione della Luna intorno alla Terra (che dura circa un mese, 29,5 giorni) la dimensione della parte illuminata della Luna aumenta gradualmente (fase crescente) diventando una mezzaluna. La mezza luna si verifica a 90 gradi dal punto di partenza. La parte illuminata della Luna continua ad aumentare, diventando gibbosa (di forma convessa o rigonfia). La luna piena si verifica a 180 gradi. Dopo questo punto, la forma inizia gradualmente a ridursi (fase calante), dando luogo alla luna gibbosa, alla fase di mezza luna a 270 gradi dall'inizio, alla luna crescente e alla luna nuova a 360 gradi. Anche se la Luna mostra una mezza fase a 90 e 270 gradi, i lati completamente opposti sono illuminati.
Termini correlati
Vedi questo termine in altre lingue
status del termine e della definizione La definizione originale di questo termine in inglese é stata approvata da un ricercatore astronomo e da un docente La traduzione di questo termine e della sua definizione sono ancora in attesa di approvazione
Il Glossario Multilingue OAE é un progetto dell'Ufficio IAU per la didatticadell'astronomia (OAE) in collaborazione con l'ufficio IAU OAO per la DivulgazioneAstronomica (OAO). I termini e le definizioni sono stater scelte, scritte eriviste da un impegno collettivo da parte di OAE, i Centri e i Nodi OAE e iCoordinatori Nazionali per la Didattica dell'Astronomia e da altri volontari.Potete trovare una lista completa dei crediti, Tutti i termini del glossarioE le definizioni sono pubblicate su Creative Commons CC BY-4.0 licenza e dovrebbero essere accreditate ad IAU OAE.
Se noti un errore di fatto o di traduzione in questo termine del glossario, per favore contattaci.
In Altre Lingue
- Arabo: الطور القمري
- Tedesco: Mondphase
- Inglese: Lunar Phase
- Francese: Phase lunaire
- Giapponese: 月の位相 (external link)
- Marathi: चंद्राच्या कला
- Cinese semplificato: 月相
- Cinese tradizionale: 月相
File multimediali correlati
Luna piena
Didascalia: L'immagine mostra la Luna quasi piena osservata con un piccolo telescopio e una fotocamera DSLR.
Crediti: Luc Viatour
link ai crediti
License: CC-BY-SA-3.0 Creative Commons Attribuzione - Condividi allo stesso modo 3.0 Unported icone
Luna piena
Didascalia: La luna piena ripresa dall'emisfero meridionale (Nuova Zelanda). Durante questa fase la metà illuminata della luna è completamente visibile dalla Terra.
Crediti: Dave Young / dcysurfer
link ai crediti
License: CC-BY-2.0 Creative Commons Attribuzione 2.0 Generico icone
Primo quarto di luna
Didascalia: Il primo quarto di luna fotografato dalla Nuova Zelanda. Poiché è visibile la metà illuminata della luna, questa fase è nota come mezza luna.
Crediti: Dave Young / dcysurfer
link ai crediti
License: CC-BY-2.0 Creative Commons Attribuzione 2.0 Generico icone
Primo quarto di luna
Didascalia: Il primo quarto di luna fotografato dall'emisfero settentrionale (USA). In questa fase è visibile la metà illuminata della luna. Questa fase è popolarmente conosciuta come mezza luna.
Crediti: Stephen Rahn
link ai crediti
License: CC0 CC0 1.0 Universal (CC0 1.0) Donazione al Pubblico Dominio icone
Ultimo quarto di luna
Didascalia: Ecco l'ultimo quarto di luna fotografato dall'emisfero settentrionale (USA). Durante questa fase è visibile la metà illuminata della luna. Questa fase è popolarmente conosciuta come mezza luna.
Crediti: Stephen Rahn
link ai crediti
License: CC0 CC0 1.0 Universal (CC0 1.0) Donazione al Pubblico Dominio icone
Diagrami correlati
Lunar Phase Northern Hemisphere
Didascalia: The phases of the Moon when viewed from the Northern Hemisphere. Here north is up and east is left. The Moon orbits the Earth every 29.5 days. It is tidally locked to the Earth meaning its rotation period is the same as its orbital period and the same side of the Moon always faces the Earth. At any particular time, half of the Moon is illuminated by the Sun and half is in shadow. Over the course of the Moon’s orbit around the Earth every part of the Moon is illuminated for half of the orbit and is in shadow for the other half of the orbit.
When the Moon sits between the Earth and the Sun its illuminated half faces away from the Earth and we only see the half that is in shadow. This phase of the Moon is known as new moon. As the Moon moves in its orbit, a small but growing sliver of the illuminated half of the Moon begins to be seen from the Earth. This illuminated sliver appears on the western side of the Moon’s face when viewed from Earth. This phase is known as waxing crescent moon. By a quarter of the way through the Moon’s orbit around the Earth the Moon appears 90° away from the Sun and half of the Moon’s illuminated half points toward the Earth. This phase is known as first quarter moon. As the orbit continues more than half of the Moon seen from Earth is now illuminated with a dark crescent. This phase is known as waxing gibbous moon. Once we reach the halfway point in the Moon’s orbit round the Earth the Moon is now on the opposite side of the Earth from the Sun and we see all of the Moon’s illuminated half. As the whole of the side of the Moon that faces the Earth is now illuminated this is referred to as full moon.
For the remaining half of the Moon’s orbit the half of the moon that faces the Earth begins to move into shadow. Hence the illuminated portion of the Moon that we see from Earth begins to shrink or wane. The western edge of the face of the Moon when viewed from Earth begins to appear dark and this grows through subsequent phases. The phases are repeated in reverse order: waning gibbous, third quarter, waning crescent and finally back to new moon.
Note the surface features of the Moon are illustrative and do not accurately represent the Moon’s true surface.
Crediti: Aneta Margraf/IAU OAE
License: CC-BY-4.0 Creative Commons Attribuzione 4.0 Internazionale (CC BY 4.0) icone
Lunar Phase Southern Hemisphere
Didascalia: The phases of the Moon when viewed from the Southern Hemisphere. Here north is up and west is left The Moon orbits the Earth every 29.5 days. It is tidally locked to the Earth meaning its rotation period is the same as its orbital period and the same side of the Moon always faces the Earth. At any particular time, half of the Moon is illuminated by the Sun and half is in shadow. Over the course of the Moon’s orbit around the Earth every part of the Moon is illuminated for half of the orbit and is in shadow for the other half of the orbit.
When the Moon sits between the Earth and the Sun its illuminated half faces away from the Earth and we only see the half that is in shadow. This phase of the Moon is known as new moon. As the Moon moves in its orbit, a small but growing sliver of the illuminated half of the Moon begins to be seen from the Earth. This illuminated sliver appears on the western side of the Moon’s face when viewed from Earth. This phase is known as waxing crescent moon. By a quarter of the way through the Moon’s orbit around the Earth the Moon appears 90° away from the Sun and half of the Moon’s illuminated half points toward the Earth. This phase is known as first quarter moon. As the orbit continues more than half of the Moon seen from Earth is now illuminated with a dark crescent. This phase is known as waxing gibbous moon. Once we reach the halfway point in the Moon’s orbit round the Earth the Moon is now on the opposite side of the Earth from the Sun and we see all of the Moon’s illuminated half. As the whole of the side of the Moon that faces the Earth is now illuminated this is referred to as full moon.
For the remaining half of the Moon’s orbit the half of the moon that faces the Earth begins to move into shadow. Hence the illuminated portion of the Moon that we see from Earth begins to shrink or wane. The western edge of the face of the Moon when viewed from Earth begins to appear dark and this grows through subsequent phases. The phases are repeated in reverse order: waning gibbous, third quarter, waning crescent and finally back to new moon.
Note the surface features of the Moon are illustrative and do not accurately represent the Moon’s true surface.
Crediti: Aneta Margraf/IAU OAE
License: CC-BY-4.0 Creative Commons Attribuzione 4.0 Internazionale (CC BY 4.0) icone
Lunar Phase Equator
Didascalia: The phases of the Moon when viewed from the Equator. Here west is up, north is left and east is down. The Moon orbits the Earth every 29.5 days. It is tidally locked to the Earth meaning its rotation period is the same as its orbital period and the same side of the Moon always faces the Earth. At any particular time, half of the Moon is illuminated by the Sun and half is in shadow. Over the course of the Moon’s orbit around the Earth every part of the Moon is illuminated for half of the orbit and is in shadow for the other half of the orbit.
When the Moon sits between the Earth and the Sun its illuminated half faces away from the Earth and we only see the half that is in shadow. This phase of the Moon is known as new moon. As the Moon moves in its orbit, a small but growing sliver of the illuminated half of the Moon begins to be seen from the Earth. This illuminated sliver appears on the western side of the Moon’s face when viewed from Earth. This phase is known as waxing crescent moon. By a quarter of the way through the Moon’s orbit around the Earth the Moon appears 90° away from the Sun and half of the Moon’s illuminated half points toward the Earth. This phase is known as first quarter moon. As the orbit continues more than half of the Moon seen from Earth is now illuminated with a dark crescent. This phase is known as waxing gibbous moon. Once we reach the halfway point in the Moon’s orbit round the Earth the Moon is now on the opposite side of the Earth from the Sun and we see all of the Moon’s illuminated half. As the whole of the side of the Moon that faces the Earth is now illuminated this is referred to as full moon.
For the remaining half of the Moon’s orbit the half of the moon that faces the Earth begins to move into shadow. Hence the illuminated portion of the Moon that we see from Earth begins to shrink or wane. The western edge of the face of the Moon when viewed from Earth begins to appear dark and this grows through subsequent phases. The phases are repeated in reverse order: waning gibbous, third quarter, waning crescent and finally back to new moon.
The perspective for this diagram is with west up, north left and east down. When the moon is viewed looking west, for example viewing the waxing crescent just after sunset, the view of the Moon would be rotated by 180°.
Note the surface features of the Moon are illustrative and do not accurately represent the Moon’s true surface.
Crediti: Aneta Margraf/IAU OAE
License: CC-BY-4.0 Creative Commons Attribuzione 4.0 Internazionale (CC BY 4.0) icone
