Question:

A full moon in 2 nights in a row?

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can that be possible?

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  1. sometimes they will say "Summer is here, tomorrow at 10:23AM!"

    that is because that is the very minute of the Solstice. That doesn't mean it will only be hot that one day.

    the Moon is Full at just one instant, when it is directly in a line with the Earth and Sun, after that it is Gibbous Waning, before Gibbous Waxing.

    in werewolf lore, its the day before and after a Full Moon that can change a man into a wolf.

    close enough for government work.


  2. Not really, no.  On the first night when it appears full, it is in fact about 90% full, so much we wouldn't notice.  And then this would appear to last for more than 1 night.

  3. mo it is not possible even full  moon not remain for through out one night

  4. It might look like it,but,it still might not be completely full.

  5. Techinically, no, it is only truly full at one specific moment.  But it will "appear" full for about 20 hours before, and about 20 hours after...  unless you are really keen on noticing subtlties in late in it's waxing gibbous (or early in it's waning gibbous) phase.  This happens every full moon, where there is common confusion, because the day before, and the day after it's "true" full phase, people will look at it, "nearly full" and call it full.  

  6. Hi Sumeja!

    Yes, it happens all the time, for a couple of reasons:

    - First is the foreshortening effect of the curvature of the moon.  Think of the lines of longitude on a globe of the earth.  Where you look straight down, the lines are well spaced, but at the edges of the globe they seem to meld together.

    On the moon, the line between lunar day and night around the time of first quarter is face-on to you, and you can see it move distinctly from night to night.  At full moon, however, this line, called the "terminator," lies at the edges of the lunar globe.  It takes a couple of days before you can start to notice the terminator moving along the edges of the lunar face.

    The result is that for two or three days around the full moon, the lunar disc seems about the same from night to night.  You cannot tell with the unaided eye that the terminator has moved over just 24 hours.

    - Second is time differences on earth, due to the effect of time zones.  Here's an example.  There's a full moon tonight, August 16th.  The official moment of the full moon, when the moon is directly opposite the sun in our sky, comes at 10:16 p.m. British Summer Time this Saturday evening.  Therefore, in England, Friday evening was one day before full moon and Sunday evening in England will be one night afterward.

    Suppose you were in Adelaide, South Australia.  The full moon in Adelaide happens at 7:46 a.m. Sunday morning, Australian Central Time.  Which evening is the full moon then?  

    As it happens, Saturday evening and Sunday evening, Adelaide time, are equally close to the full moon, about 12 hours distant from the official moment.  If you were looking from Adelaide, in the evening (which is when most people look), you would say that Saturday evening and Sunday evening are both nights of the full moon.

    Incidentally, most commercially-produced calendars show the dates of lunar phases according to Greenwich Mean Time, not the local time where the calendar is sold.  Moreover, they count a full moon at 12:01 a.m. on a Sunday morning as a Sunday full moon, even though if you went looking that Sunday evening, notice how you'd be as much as 23 hours too late.

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