Astronomical Info / 天文資訊 > Special Events / 特別項目 > Total Solar Eclipse of December 4th, 2021 | 2021 年 12 月 4 日之日全食 [Refresh 更新]
Quick info 快速資訊: Eclipse not visible in Hong Kong. 是次日食於香港不可見。
 Live webcast 網上直播 |
Please click on the links below for live webcast. All links redirect you to external websites and open in new windows unless stated otherwise. 請按下列連結以觀看網上直播。除非另作說明，所有連結連至第三者網站並以新視窗開啟。
| Live Webcast 網上直播 |
- Timeanddate.com (Live blog only 僅提供網誌直播) |
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| Eclipse Simulation 日食模擬 |
| - Global Solar Eclipse Simulation 全球日食模擬
This simulation, provided by HKWW, presents to you the local conditions at cities in the eclipse zone during the eclipse. The page is set to refresh once every ten minutes but images are redrawn minute-by-minute. Press F5 to refresh your screen manually. 該日食模擬由本站提供，顯示全球可見日食地區的太陽 / 月球之相對位置。該頁每 10 分鐘重新整理一次，但圖像則於每分鐘更新；請按 F5 鍵以手動重新整理頁面。 |
| Information about the eclipse 是次日食資料 |
A total solar eclipse will occur on December 4 in the extreme southern side of the globe. The umbral shadow of the Moon hits Earth near 7:00 UTC (15:00 HKT) in the seas east of the Falkland Islands. It then migrates southwards, entering Antarctica near 7:35 UTC (15:35 HKT) which is also around the time of greatest eclipse. As the umbral shadow hits the backside of the Earth, the path of totality travels westwards (relative to the ground) while on Antarctica, before moving north and entering the Antarctic Ocean again near 8:00 UTC (16:00 HKT). The shadow lifts off the Earth's surface just after 8:05 UTC (16:05 HKT), marking the end of totality on Earth.
A partial eclipse can be observed within a wider area surrounding the path of totality. However, except for Antarctica, the only landmasses covered by this area include the extreme southern part of Argentina, southern Africa, southern Australia and southern New Zealand.
一次日全食將於 12 月 4 日於地球南端發生。當日，月球本影於世界協調時約 7:00 (香港時間 15:00) 在福克蘭群島以東海域進入地球，隨後南移並於世界協調時約 7:35 (香港時間 15:35) 到達南極洲，這亦是本次日食食甚之時。由於月球本影落於地球背面，它於南極洲轉向偏西移動 (相對於地面)，其後北移並於世界協調時約 8:00 (香港時間 16:00) 再次進入南冰洋。月球本影將於世界協調時約 8:05 (香港時間 16:05) 離開地球表面，日全食至此結束。
雖然全食帶以外的較廣闊區域內可見日偏食，但除南極洲外，此區域只覆蓋阿根廷南端、非洲南部、澳洲南部及紐西蘭南部等少量陸地。
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The following shows some general details about the eclipse*:
下表列出是次日食的一般性資料* :
| Eclipse series and characteristics 日食序列和特徵 |
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| Saros series number 沙羅序列號碼 | 152 (occurring at Moon's descending node 降交點日食) |
| Member in the series 序列中次數 | 13 out of 70 | 70 次中的第 13 次 |
| Gamma 伽馬數 | -0.9526 earth radii 地球半徑 |
| Event 事件 |
Time in UTC/HKT on December 4 12 月 4 日世界協調時 / 香港時間 |
| P1 - Penumbral cone starts to strike Earth (partial eclipse on Earth starts) P1 - 半影區到達地球 (日偏食開始) |
05:29:17 / 13:29:17 |
| U1 - Umbra starts to strike Earth (total eclipse on Earth starts) U1 - 本影區到達地球 (日全食開始) |
07:00:07 / 15:00:07 |
U2 - Umbra fully strikes Earth |
07:05:55 / 15:05:55 |
| P2 - Penumbral cone fully strikes Earth P2 - 整個半影區到達地球 |
No such occurrence in this eclipse 是次日食並無此事件 |
| P3 - Penumbral cone starts to leave Earth P3 - 半影區開始離開地球 |
No such occurrence in this eclipse 是次日食並無此事件 |
U3 - Umbra starts to leave Earth |
08:00:46 / 16:00:46 |
| U4 - Umbra fully leaves Earth (total eclipse on Earth ends) U4 - 整個本影區離開地球 (日全食結束) |
08:06:34 / 16:06:34 |
| P4 - Penumbral cone fully leaves Earth (partial eclipse on Earth ends) P4 - 整個半影區離開地球 (日偏食結束) |
09:37:29 / 17:37:29 |
| Information at greatest eclipse (i.e. when the axis of the Moon's shadow cone is closest to the Earth's centre) 最大食時資料 (即月影軸最近地心一刻) |
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| Location 位置 | 76°46.6' S, 46°13.9' W (near Antarctica 接近南極洲) |
| Time 時間 | Dec 4 07:33:28 UTC / 15:33:28 HKT |
| Magnitude 食分 | 1.0367 |
| Duration of totality 全食持續時間 | 1' 54.4'' |
| Width of totality 全食徑寬度 | 418.8 km 公里 |
| Solar Altitude and Azimuth 該位置的太陽高度和方位角 | Altitude 高度: 17.2° ; Azimuth 方位角: 114.8° (ESE 東南偏東) |
* Times are slightly different (a few seconds) from those indicated in the figure from NASA above due to the difference in observed and predicted values of ΔT. The current prediction of the value of ΔT on the eclipse date is 69.3 seconds.
* 由於實測及預計 ΔT 值有數秒的差距，表中所列時間與上面美國太空總署圖片中所示時間有些微差別。按照目前估計，日食日期的 ΔT 值為 69.3 秒。
Note that unlike lunar eclipse, not all places experience these times as the moon moves across the sky (and so does its shadow). They serve to show the times at which there exists at least a location on Earth that can experience those events.
不同於月食，由於月球和它的影子在地球上不是靜止不動，不同的地方將於不同的時間見到日食。以上的一般性資料為全球性資訊；它們並不代表某個地方的日食時間。
| Local (HK) circumstances 本地 (香港) 情況 |
This eclipse will not be visible in Hong Kong.
這次日食於香港將不可見。
| Circumstances for major cities 各大城市日食概況 |
The path of totality passes through the following major countries/regions (areas where the path only briefly passes through are not included):
全食帶經過以下主要國家和地區 (不包含食帶只剛剛擦過的地點) :
- Antarctica 南極洲
The following table lists the circumstances for some major cities where the eclipse can be observed:
下表顯示部分可觀是次日食城市的概況 :
| Location 地點 |
Lcl time zone 當地時區 |
Eclipse starts/Sunrise 日食開始/日出 |
Central starts 中心食開始 |
Max eclipse 食甚 |
Central ends 中心食完結 |
Eclipse ends/Sunset 日食完結/日落 |
GE alt 食甚高度 |
GE azi 食甚方位角 |
Mag 食分 |
Obs 面積比 |
Central duration 中心食長度 |
| Local Date December 4 當地時間 12 月 4 日 | |||||||||||
| Stanley (Falkland Islands) 斯坦利港 (福克蘭群島) |
-3 hr | 15:29:55 R [04:29:55 R] |
--- | --- | --- | 15:52:40 [04:52:40] |
-0.8° | 129.0° | 0.484 | 0.376 | --- |
| King Edward Pt (S Georgia) 愛德華國王角 (南喬治亞島) |
-2 hr | 14:08:28 [04:08:28] |
--- | 14:57:12 [04:57:12] |
--- | 15:48:02 [05:48:02] |
7.2° | 118.6° | 0.966 | 0.965 | --- |
| Cape Town (S Africa) 開普敦 (南非) |
+2 hr | 13:42:35 [07:42:35] |
--- | 14:19:17 [08:19:17] |
--- | 14:58:10 [08:58:10] |
33.0° | 96.2° | 0.214 | 0.116 | --- |
| South Pole* 南極點* |
+13 hr | 15:00:01 [20:00:01] |
--- | 15:54:53 [20:54:53] |
--- | 16:49:44 [21:49:44] |
22.3° | 58.8° | 0.917 | 0.904 | --- |
| McMurdo Station (Antarctica)* 麥克默多站 (南極洲)* |
+13 hr | 15:00:01 [20:00:01] |
--- | 15:54:52 [20:54:52] |
--- | 16:49:43 [21:49:43] |
22.3° | 58.8° | 0.916 | 0.903 | --- |
| Hobart (Australia) 荷伯特 (澳洲) |
+11 hr | 16:34:21 [19:34:21] |
--- | 17:06:06 [20:06:06] |
--- | 17:35:51 S [20:35:51 S] |
3.9° | 242.9° | 0.206 | 0.110 | --- |
*For locations in Antarctica, the time zones used in the respective research stations are displayed.
*位於南極洲的地點採用其研究站的時區。
Notes 備註 :
- A solar eclipse always starts as partial eclipse starts or at sunrise, and always ends as partial eclipse finishes or at sunset. 日食必會於日出或初虧時開始，而於日落或復圓時結束。
- Time of maximum eclipse is not shown if an observer at that location can only see less than half of the eclipse; such places must experience maximum eclipse at sunrise or sunset. 如某地只見到少於一半日食過程，食甚時間必為日出或日落，因此不再另外顯示。
- For each time, the first line refers to HKT and the second line local time; daylight saving has been accounted for. 首行時間為香港時間；次行時間為當地時間 (已包含日光節約時間)。
- Abbreviations: "R" = Sunrise; "A" = Annular eclipse; "T" = Total eclipse; "S" = Sunset. 縮寫 : "R" = 日出; "A" = 環食; "T" = 全食; "S" = 日落。
- Central eclipse refers to totality or annularity. 中心食即全食或環食階段。
| Future solar eclipses 未來日食 |
Solar eclipses in the next five years (click on the date to see the eclipse path):
未來五年的日食資料 (請按下日期以觀看日食路徑) :
| Date (UTC) 日期 (世界協調時) |
Eclipse type 日食類型 |
Eclipse type at HK 香港可見日食類型 |
Magnitude at HK and time 香港可見食分及(香港)時間 |
| 2022/04/30 | Partial 偏食 | --- | --- |
| 2022/10/25 | Partial 偏食 | --- | --- |
| 2023/04/20 | Hybrid 全環食 | Partial 偏食 | 0.027 ; 12:55 HKT |
| 2023/10/14 | Annular 環食 | --- | --- |
| 2024/04/08 | Total 全食 | --- | --- |
| 2024/10/02 | Annular 環食 | --- | --- |
| 2025/03/29 | Partial 偏食 | --- | --- |
| 2025/09/21 | Partial 偏食 | --- | --- |
| 2026/02/17 | Annular 環食 | --- | --- |
| 2026/08/12 | Total 全食 | --- | --- |
The hybrid solar eclipse in 2023 will appear as a very slight partial eclipse in Hong Kong, hardly visible with the naked eye.
2023 年將出現一次全環食，屆時香港可見一次食分非常低的偏食，難以利用肉眼觀測。
| Solar eclipse knowledge, figures and Q&A 日食知識、數字和問答 |
The following links open in new windows. 以下連結於新頁開啟。
- Solar eclipse basic knowledge 日食基礎知識
- Eclipse Dates and Numbers - Solar Eclipse 日食日期和數字
- Eclipse Glossary 日月食術語
- Eclipse Q&A (total 3 pages) 日月食問與答 (共三頁) [English] [中文]
| Solar eclipse calculator 日食計算機 |
Our site now features a solar eclipse calculator that allows user to compute eclipse visibility information for any place on Earth. Please click on the link below to use this utility. 本站現已設立一日食計算機，各位可利用它來計算出地球上某地可觀看的日食資料。請按以下連結以使用該計算機。
Eclipse times and information are based on Eclipse Predictions by Fred Espenak, NASA's GSFC. NASA's solar eclipse page: here.
Last Accessed 最近訪問日期: Wed Jul 09 2025 11:11:06 HKT
Last Modified 最近修訂日期: Mon Jul 24 2023
