Quick info 快速資訊: Eclipse not visible in Hong Kong. 月食於香港不可見。Quick links 快速連結:
|- Live webcast 網上直播||- Information about the eclipse 是次月食資料|
|- Local (HK) circumstances 本地 (香港) 情況||- Future lunar eclipses 未來月食|
|- Lunar eclipse basic knowledge 月食基礎知識||- More eclipse info 更多日月食資訊|
|Live webcast 網上直播|
Please click on the links below for live webcast and descriptions of the event. All links (on the left panel) redirect you to external websites and open in new windows. Most channels are from the US or western Europe, where the eclipse takes place during the night of September 27/28 local time, or morning of September 28 Hong Kong Time.
請按下列連結以觀看網上直播及相關資訊。所有 (左方) 連結連至第三者網站並以新視窗開啟。大多數直播點於美國或西歐，當地月食時間為 9 月 27 至 28 日晚上，即香港時間 28 日早上。
|Provider 提供者||Notes 備註|
At Canary Islands, Spain 於西班牙加那利亞群島
|- Griffith Observatory||
At Los Angeles, USA 於美國洛杉磯
|- Sky & Telescope|
|- Virtual Telescope|
|- Skycenter, University of Arizona||At Tucson, USA 於美國圖森|
|- University of Barcelona||At Barcelona, Spain 於西班牙巴塞隆拿|
|Information about the eclipse 是次月食資料|
This is the second total lunar eclipse in 2015, and is also the last of the 2014/15 tetrad. It is interesting to note that this is the first total eclipse since 1997 to take place on mid-autumn festival. The eclipse will be visible in its entirety in eastern North America, the whole of South America, western Europe and western Africa. Most of western North America will experience the event at moonrise, while eastern Europe, eastern Africa and western Asia will see the eclipse at moonset. This event is not visible in Oceania or central/eastern Asia.
此為 2015 年第二次月全食，亦為 2014/15 年間連續四次全食的最後一次，同時亦是自 1997 年以來首次於中秋節出現的月全食。北美洲東部、南美洲、西歐及西非將可見整個月食過程；北美洲西部大部分地區將見帶食月出，而東歐、東非及西亞則見帶食月落。是次月食於大洋洲及中東亞不可見。
Map courtesy of NASA
The following shows some general details about the eclipse:
|Eclipse series and characteristics
|Saros series number 沙羅序列號碼||137 (occurring at descending node 降交點月食)|
|Member in the series 序列中次數||28 out of 81 | 81 次中的第 28 次|
|Gamma 伽馬數||-0.3296 earth radii 地球半徑|
|Time in UTC/HKT
時間 (世界協調時 / 香港時間)/
|P1 - Moon enters Earth's penumbra (penumbral eclipse starts)
P1 - 月球進入地球的半影 (半影月食開始)
|Sep 28 00:11:47 UTC; 08:11:47 HKT|
|U1 - Moon enters Earth's umbra (partial eclipse starts)
U1 - 月球進入地球的本影 (初虧，月偏食開始)
|Sep 28 01:07:11 UTC; 09:07:11 HKT|
|U2 - Moon fully enters Earth's umbra (total eclipse starts)
U2 - 整個月球進入地球的本影 (食既，月全食開始)
|Sep 28 02:11:10 UTC; 10:11:10 HKT|
|Sep 28 02:47:08 UTC; 10:47:08 HKT|
|U3 - Moon starts to leave Earth's umbra (total eclipse ends)
U3 - 月球開始離開地球的本影 (生光，月全食結束)
|Sep 28 03:23:05 UTC; 11:23:05 HKT|
U4 - Moon fully leaves Earth's umbra (partial eclipse ends)
|Sep 28 04:27:03 UTC; 12:27:03 HKT|
|P4 - Moon fully leaves Earth's penumbra (penumbral eclipse ends)
P4 - 整個月球離開地球的半影 (半影月食結束)
|Sep 28 05:22:27 UTC; 13:22:27 HKT|
|Information at greatest eclipse
食甚 (食分最大) 時資料
|Time 時間||Sep 28 02:47:08 UTC; 10:47:08 HKT|
|Penumbral Magnitude (P) and Umbral Magnitude (U) 半影食分 (P) 和本影食分 (U)||P: 2.2296; U: 1.2764|
All places that can observe this eclipse (no matter what the Moon's position is) will experience the aforementioned events in the times indicated above.
|Local (HK) circumstances 本地 (香港) 情況|
This eclipse is not visible in Hong Kong.
|Future lunar eclipses 未來月食|
Lunar eclipses in the next five years (click on the date to see the visible areas for that eclipse):
未來五年的月食資料 (請按下日期以觀看月食可見範圍) :
|Eclipse type at HK
|Time of greatest eclipse
|2016/03/23||Penumbral 半影月食||P: 0.7747; U: -0.3118||Penumbral 半影月食||19:47|
|2016/09/16||Penumbral 半影月食||P: 0.9080; U: -0.0635||Penumbral 半影月食||09/17 02:54|
|2017/02/11||Penumbral 半影月食||P: 0.9884; U: -0.0354||Penumbral 半影月食||06:54 (moonset 月落)|
|2017/08/07||Partial 月偏食||P: 1.2886; U: 0.2464||Partial 月偏食||08/08 02:20|
|2018/01/31||Total 月全食||P: 2.2941; U: 1.3155||Total 月全食||21:30|
|2018/07/27||Total 月全食||P: 2.6792; U: 1.6087||Total 月全食||07/28 04:21|
|2019/01/21||Total 月全食||P: 2.1684; U: 1.1953||---||---|
|2019/07/16||Partial 月偏食||P: 1.7037; U: 0.6531||Partial 月偏食||07/17 05:31|
|2020/01/10||Penumbral 半影月食||P: 0.8956; U: -0.1160||Penumbral 半影月食||01/11 03:10|
|2020/06/05||Penumbral 半影月食||P: 0.5683; U: -0.4053||Penumbral 半影月食||06/06 03:25|
|2020/07/05||Penumbral 半影月食||P: 0.3546; U: -0.6436||---||---|
* P represents penumbral magnitude while U represents umbral magnitude.
* P 和 U 分別代表半影食分和本影食分。
The next three lunar eclipses are all penumbral and will be visible in Hong Kong. The next partial eclipse will take place in August 2017, and is also visible in Hong Kong.
接下來的三次月食皆為半影食，均可於香港見到，而下一次月偏食會於 2017 年 8 月出現，同樣於香港可見。
|Lunar eclipse basic knowledge 月食基礎知識|
A lunar eclipse occurs whenever the Moon passes through some portion of the Earth's shadow. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, there is always a full moon the night of a lunar eclipse. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes.
The shadow of the Earth can be divided into two distinctive parts: the umbra and penumbra. Within the umbra, there is no direct solar radiation. However, as a result of the Sun's large angular size, solar illumination is only partially blocked in the outer portion of the Earth's shadow, which is given the name penumbra.
A penumbral eclipse occurs when the Moon passes through the Earth's penumbra. The penumbra does not cause any noticeable darkening of the Moon's surface, though some may argue it turns a little yellow. A special type of penumbral eclipse is a total penumbral eclipse, during which the Moon lies exclusively within the Earth's penumbra. Total penumbral eclipses are rare, and when these occur, that portion of the Moon which is closest to the umbra can appear somewhat darker than the rest of the Moon.
A partial lunar eclipse occurs when only a portion of the Moon enters the umbra. When the Moon travels completely into the Earth's umbra, one observes a total lunar eclipse. The Moon's speed through the shadow is about one kilometer per second (2,300 mph), and totality may last up to nearly 107 minutes. Nevertheless, the total time between the Moon's first and last contact with the shadow is much longer, and could last up to 3.8 hours. The relative distance of the Moon from the Earth at the time of an eclipse can affect the eclipse's duration. In particular, when the Moon is near its apogee, the farthest point from the Earth in its orbit, its orbital speed is the slowest. The diameter of the umbra does not decrease much with distance. Thus, a totally-eclipsed Moon occurring near apogee will lengthen the duration of totality.
The Moon does not completely disappear as it passes through the umbra because of the refraction of sunlight by the Earth's atmosphere into the shadow cone; if the Earth had no atmosphere, the Moon would be completely dark during an eclipse. The red colouring arises because sunlight reaching the Moon must pass through a long and dense layer of the Earth's atmosphere, where it is scattered. Shorter wavelengths are more likely to be scattered by the small particles, and so by the time the light has passed through the atmosphere, the longer wavelengths dominate. This resulting light we perceive as red. This is the same effect that causes sunsets and sunrises to turn the sky a reddish colour; an alternative way of considering the problem is to realise that, as viewed from the Moon, the Sun would appear to be setting (or rising) behind the Earth.
The amount of refracted light depends on the amount of dust or clouds in the atmosphere; this also controls how much light is scattered. In general, the dustier the atmosphere, the more that other wavelengths of light will be removed (compared to red light), leaving the resulting light a deeper red colour. This causes the resulting coppery-red hue of the Moon to vary from one eclipse to the next. Volcanoes are notable for expelling large quantities of dust into the atmosphere, and a large eruption shortly before an eclipse can have a large effect on the resulting colour.
|More eclipse info 更多日月食資訊|
Eclipse times and information are based on Eclipse Predictions by Fred Espenak, NASA's GSFC. NASA's lunar eclipse page: here.
Last Accessed 最近訪問日期: Mon Sep 28 2020 20:15:58 HKT
Last Modified 最近修訂日期: Sun Jul 16 2017