<P> In Western culture, the four principal lunar phases are new moon, first quarter, full moon, and third quarter (also known as last quarter). These are the instances when the Moon's apparent geocentric celestial longitude minus the Sun's apparent geocentric celestial longitude is 0 °, 90 °, 180 ° and 270 °, respectively . Each of these phases occur at slightly different times when viewed from different points on the Earth . During the intervals between principal phases, the Moon appears either crescent - shaped or gibbous . These shapes, and the periods of time when the Moon shows them, are called the intermediate phases . They last, on average, one - quarter of a synodic month, roughly 7.38 days, but their durations vary slightly because the Moon's orbit is slightly elliptical, and thus its speed in orbit is not constant . The descriptor waxing is used for an intermediate phase when the Moon's apparent size is increasing, from new moon toward full moon, and waning when the size is decreasing . </P> <P> The eight principal and intermediate phases are given the following names, in sequential order: </P> <Table> Principal and intermediate phases of the Moon <Tr> <Th> Phase </Th> <Th> Northern Hemisphere </Th> <Th> Southern Hemisphere </Th> <Th> Visibility </Th> <Th> Mid-phase standard time </Th> <Th> Average moonrise time </Th> <Th> Average moonset time </Th> <Th> Northern Hemisphere </Th> <Th> Southern Hemisphere </Th> <Th> Photograph </Th> </Tr> <Tr> <Th> New moon </Th> <Td_colspan="2"> Disc completely in Sun's shadow (lit by earthshine only) </Td> <Td> Invisible (too close to Sun) </Td> <Td> Midday </Td> <Td> 6 am </Td> <Td> 6 pm </Td> <Td> </Td> <Td> </Td> <Td> Not visible </Td> </Tr> <Tr> <Th> Waxing crescent </Th> <Td> Right side, 1--49% lit disc </Td> <Td> Left side, 1--49% lit disc </Td> <Td> Late morning to post-dusk </Td> <Td> 3 pm </Td> <Td> 9 am </Td> <Td> 9 pm </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> First quarter </Th> <Td> Right side, 50% lit disc </Td> <Td> Left side, 50% lit disc </Td> <Td> Afternoon and early evening </Td> <Td> 6 pm </Td> <Td> Midday </Td> <Td> Midnight </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Waxing gibbous </Th> <Td> Right side, 51--99% lit disc </Td> <Td> Left side, 51--99% lit disc </Td> <Td> Late afternoon and most of night </Td> <Td> 9 pm </Td> <Td> 3 pm </Td> <Td> 3 am </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Full moon </Th> <Td_colspan="2"> Completely illuminated disc </Td> <Td> Sunset to sunrise (all night) </Td> <Td> Midnight </Td> <Td> 6 pm </Td> <Td> 6 am </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Waning gibbous </Th> <Td> Left side, 99--51% lit disc </Td> <Td> Right side, 99--51% lit disc </Td> <Td> Most of night and early morning </Td> <Td> 3 am </Td> <Td> 9 pm </Td> <Td> 9 am </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Third quarter (or last quarter) </Th> <Td> Left side, 50% lit disc </Td> <Td> Right side, 50% lit disc </Td> <Td> Late night and morning </Td> <Td> 6 am </Td> <Td> Midnight </Td> <Td> Midday </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Waning crescent </Th> <Td> Left side, 49--1% lit disc </Td> <Td> Right side, 49--1% lit disc </Td> <Td> Pre-dawn to early afternoon </Td> <Td> 9 am </Td> <Td> 3 am </Td> <Td> 3 pm </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Phase </Th> <Th> Northern Hemisphere </Th> <Th> Southern Hemisphere </Th> <Th> Visibility </Th> <Th> Mid-phase standard time </Th> <Th> Average moonrise time </Th> <Th> Average moonset time </Th> <Th> Northern Hemisphere </Th> <Th> Southern Hemisphere </Th> <Th> Photograph </Th> </Tr>

What are the names of the different shapes of the moon
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