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  • A Summer of Super Moons presented by Science@NASA


  • In June of last year, a full Moon made headlines.


  • The news media called it a "supermoon" because it was 14% bigger and 30% brighter than other full Moons of 2013.


  • Around the world, people went outside to marvel at its luminosity.


  • If you thought one supermoon was bright, how about three....?


  • The full Moons of summer 2014, July 12th, August 10th and Sept 9th will all be supermoons.

    2014暑假的滿月落在 7/12,8/10和 9/9--且都將會是超級月亮。

  • The scientific term for the phenomenon is 'perigee moon.'


  • Full Moons vary in size because of the oval shape of the Moon's orbit.


  • The Moon follows an elliptical path around Earth with one side ('perigee') about 50,000 km closer than the other ('apogee').


  • Full Moons that occur on the perigee side of the Moon's orbit seem extra big and bright.


  • This coincidence happens three times in 2014.


  • On July 12th and Sept 9th, the Moon becomes full on the same day as perigee.


  • On August 10th it becomes full during the same hour as perigee arguably making it an extra-super Moon.


  • It might seem that such a sequence must be rare.


  • Not so, says Geoff Chester of the US Naval Observatory.

    美國海軍天文台人員 Geoff Chester 不這麼認為。

  • Generally speaking, full Moons occur near perigee every 13 months and 18 days, so it's not all that unusual,” he says.

    “大體上,每13個月又18天 滿月會在近地點旁發生,所以並非所有都那麼不尋常,”他說。

  • In fact, just last year there were three perigee Moons in a row, but only one was widely reported.”


  • In practice, it's not always easy to tell the difference between a supermoon and an ordinary full Moon.


  • A 30% difference in brightness can easily be masked by clouds and haze.


  • Also, there are no rulers floating in the sky to measure lunar diameters.


  • Hanging high overhead with no reference points to provide a sense of scale, one full Moon looks about the same size as any other.


  • Chester expects most reports of giant Moons this summer to be ...

    Chester 預期對於這個暑假超大月亮的報導多屬...

  • illusory.


  • ''The Moon Illusion is probably what will make people remember this coming set of Full Moons, more than the actual view of the Moon itself,” he says.


  • The illusion occurs when the Moon is near the horizon.


  • For reasons not fully understood by astronomers or psychologists, low-hanging Moons look unnaturally large when they beam through trees, buildings and other foreground objects.

    因為天文學家和心理學者還無法充分了解低懸月的光穿越樹林, 建築物與其他最前景的物體時, 看起來大的不自然。

  • When the Moon illusion amplifies a perigee Moon, the swollen orb rising in the east at sunset can seem super indeed.


  • "I guarantee that some folks will think it's the biggest Moon they've ever seen if they catch it rising over a distant horizon, because the media will have told them to pay attention to this particular one," says Chester.

    "我敢保證有些人會認為這是他們看過最大的月亮,假如他們能抓住高於地平線的它,因為媒體會跟他們說要注意特別的這個," Chester說。

  • "There's a part of me that wishes that this 'super-Moon' moniker would just dry up and blow away, like the term 'Blood-Moon' that accompanied the most recent lunar eclipse, because it tends to promulgate a lot of mis-information," admits Chester.

    我也有一些心願就是 "超級月亮" 的稱號能日漸被淡忘,隨風而逝,就像 "血月亮" 這個說詞是伴隨著最近的月蝕而誕生的,因為這樣總會傳達許多錯誤資訊,Chester 坦承。

  • "However, if it gets people out and looking at the night sky and maybe hooks them into astronomy, then it's a good thing."


  • Indeed it is.


  • Mark your calendar July 12th, August 10th, and Sept 9th and enjoy the super-moonlight !

    在你的月曆標上 7/12, 8/10, 9/9 然後等著享受超亮月光吧!

  • For more news about big bright things in the night sky, visit science. nasa. gov.


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超級月亮為何又大又圓又亮? (ScienceCasts: A Summer of Super Moons)

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    Halu Hsieh 發佈於 2014 年 09 月 09 日