Alan Chu’s Workshop


This site is my “workshop” more than a webpage.


Contact me: (Alan Chu 朱永鴻)      



Photographic Moon Book  



Version 3.5   Download  (PDF, 257 pages, 124 MB)


A mirror is maintained by the courtesy of Whitepeak Observatory, which is more readily accessible to North American readers at




《基本天文學課程  第三版》 



Download  (PDF, 368 pages, 128 MB)


本課程以物理論述基本天文學的主要範疇,包括十五篇講義共三百六十頁,插圖九百餘幅,對象為高中至大學初級有數理基礎和天文入門知識的學生 / 自修人士,講義後的  歷史回顧 介紹一些相關的天文學史,Q&A 是供學員溫習和思考用的。 


This book in Chinese is also posted in the Forum of Hong Kong Astronomical Society




Classic Refractors

Brashear 11-in refractor.jpg



Outburst of Comet 17P / Holmes 

It has grown to 1.1 solar diameter on 2007 Nov 09 

Comet_17P_071109_1708UT_50pct.jpg  (Telephoto lens)

Comet_17P_071109_1508UT_50pct.jpg  (8cm f/5 refractor)


Notes on 17P


Mercury Transit in 2006






All captured in Cheung Chau Island with 9cm Makustov, manual tracking.


Mars 2005

P050704a.jpg (Dia. 9.5 arcsec, 10-in Newtonian)

P050705b.jpg (Dia. 9.6 arcsec, 6-in f/8 Newtonian)

P050719a.jpg (Dia. 10.4 arcsec, 10-in Newtonian)

P050822a.jpg (Dia. 13.2 arcsec, 10-in Newtonian) 

    Mars, from 2005 July 04 to August 22

P050906a.jpg (Dia. 14.8 arcsec, 10-in Newtonian)

P050930a.jpg (Dia. 17.8 arcsec, 10-in Newtonian)

P051006a.jpg (Dia. 18.5 arcsec, 10-in Newtonian) 

P051010a.jpg (Dia. 19.0 arcsec, 10-in Newtonian)

P051014a.jpg (Dia. 19.4 arcsec, 10-in Newtonian)

P051019a.jpg (Dia. 19.8 arcsec, 10-in Newtonian) 

P051019b.jpg (Mars image resized by 200 %)    

Mars_madness_051019c.jpg (Mars madness !)    

P051023a.jpg  (Dia. 20.0 arcsec, 10-in Newtonian) 

P051025a.jpg  (Dia. 20.1 arcsec, Dust storm) 

P051028a.jpg  (2 days before closest encounter)


Mars, from 2005 Sept 09 to Oct 28 

P051102a.jpg (Dia, 20.1 arcsec, 5 days before opposition)

P051103a.jpg (Dia. 20.1 arcsec, 4 days before opposition)  

P051104a.jpg (Dia. 20.0 arcsec, 3 days before opposition)    

P051105a.jpg (Dia. 20.0 arcsec, 2 days before opposition) 

P051106a.jpg (Dia. 19.9 arcsec, 1 day before opposition) 

Mars_CraterSchiaparelli.jpg (Largest crater on Mars)  

P051109a.jpg (Mars, 2 days after opposition, very bad seeing)  

P051111a.jpg (Mars, Dia.19.6 arcsec, good seeing)

P051116a.jpg (Mars, Dia.19.0 arcsec, bad seeing)

P051119a.jpg ((Mars, Dia.18.6 arcsec, windy) 

P051202a.jpg (Mars, Dia.16.6 arcsec) 


Mars 2003

Map of Mars (火星地圖)


Mars_SP_2003.jpg (White Cap in South Pole 南極冠的變化)

Mars_MonsOlympus_2003.jpg (Mons Olympus 奧林匹斯火山)

P030713a.jpg (10-in f/6 Newtonian)

P030826a.jpg (ETX90 Maksutov)

P030827a.jpg (10-in f/6 Newtonian)

P030829a.jpg (FS128 refractor)

P030830b.jpg (FS102 refractor)

P030909a.jpg (10-in f/6 Newtonian)

P030909b.jpg (3-in refractor)

Town Mars in Pennsylvania, USA (2003 pictures)


Mars 2001

P010622a.jpg (C9 SCT, afocal imaging) 


Mars in 1956, 1971 & 1986 (Text in Chinese)





Jupiter 2005

Jupiter_050706a.jpg (Orion 6-in f/8 Newtonian)


The Sun in whitelight

Sunspot69_sequence.jpg (AR 69)


S030530a.jpg (AR365)

S031025b.jpg (AR486)


S041027a.jpg (AR687)

S041102a.jpg (AR693)

Sunspot_2005Nov18_21.jpg (AR822)  

Sunspot_051122a.jpg (AR822, quick change of shape in 24 hrs! )  

Sunspot_051123a.jpg (AR822) 

Sunspot_2005Nov22_24.jpg (AR822) 

Sunspot_051202a.jpg (AR826 & AR828) 

Sunspot_051203a.jpg (AR826)  

S070319_solareclipse_6frames.jpg (partial solar eclipse, 2007 Mar 19)


2004 Venus Transit

2004Venus Transit_path.jpg

2004Venus Transit_position angles.jpg

2004Venus Transit_blackdrop.jpg

2004Venus Transit_cloudy.jpg

2004Venus Transit_sunset_1.jpg

2004Venus Transit_sunset_all.jpg


Other astro stuff

l          Amateur Astronomy in Hong Kong – A Brief History (Word format, 5 MB)

It covers Year 1945 to 2001 only.

l          Chinese Astronomy 1982 - 1992 (中國天文學在前進 1982 -1992)

34-min video documentary, PAL, dubbed in DVD with Mandarin & English narration.

l          A collection about the history of HK astronomy before WW II (Word, 760 KB)

l          中國古代的星官和曆法 (Pdf, 3.7 MB)

l          牽星術 (Chinese Word, 500 KB) 

l          X-射線天文學 - 簡介 (Chinese Word, 350 KB)

l          X-ray Binaries (Word, 210 KB)

l          If you are interested in extrasolar planets (Word, 300 KB)

l          Demotion of Pluto by IAU (Word, 40 KB)

l          An experience with mini equatorial mount Tak-TGSE (Word, 0.5 MB)

l          Eyepiece Adapter for ToUcam Imaging (Jpg)

l          《大眾天文學在中國》 (Chinese translation of Flammarion’s Astronomie Populaire (Jpg)

l          生活中的天文 (Chinese Word)

l          A talk on Lantern Festival + Lunar Eclipse (2007Mar03, Chinese Powerpoint, 0.5 MB)

l          McNaught彗星的尾巴和軌道 (Chinese Word, 360 KB)

l          天文愛好者的寶貝 ¾ 望遠鏡 (Chinese Powerpoint, 12 MB)

l          沙羅食周 (Chinese Word, 0.5 MB)

l          地球倒數 (Chinese Word, 42 KB)

l          笑問牽牛與織女,是誰先過鵲橋來 (Chinese Word, 320 KB) 

l          地球的磁極究竟在那裡?  (Chinese Word, 150 KB) 

l          類星體 Quasar 耀變體 Blazar (Chinese Word, 0.6 MB KB) 

l          沒有透鏡的時代 (景符、象限儀)  (Chinese Word, 450 KB) 

l          西方曆法簡介 (儒略曆、格里曆、JD、閏秒)  (Chinese Word, 380 KB) 

l          Notes on Machu Picchu in Peru (Word, 0.7 MB) 

l          從月震想到地震 (Chinese Word, 410 KB)  

l          RMS Titanic 1912年的日食 (Chinese Word, 28 KB) 

l          我的天文三部曲 (Chinese Word, 300 KB)

l          從近年天災想起 (Chinese Word, 200 KB) 

l          SN 2008D 超新星和 Swift 太空望遠鏡  (Chinese Word, 430 KB) 

l          香港是個隕擊坑嗎 ?  (Chinese Word, 500 KB) 

l          2008.06.21「熄燈行動」前後的夜空亮度  (Chinese PDF, 500 KB)  

l          太陽系的質心  (Chinese Word, 120 KB) 

l          中國古籍記載的「小孔成像」 (Chinese Word, 150 KB) 

l          Red Sky 2008 August 20  (Word, 100 KB) 

l          Calculus, A Brief Tour (Word, 600 KB)

l          Dr. George Coyne, a priest and an astronomer (Word, 110 KB) 

l          歲差  (Chinese Word, 410KB)  

l          明末以後中國天文落後的原因  (Chinese Word, 200 KB)  

l          黑洞的疑惑 ¾ 在科學和科幻之間 (Chinese Word, 900 KB)  

l          CloudFront_2009Jan06.jpg (Jpeg, 170 KB)

l          Sunlight in polluted air_2009Feb (Jpeg, 180 KB)

l          射電天文學 (Chinese Powerpoint, 38MB) 

l          2009.03.28「熄燈一小時前」前後的夜空亮度 (Jpeg, 380 KB) 

l          中環夜空亮度調查 --- 200961721  (Chinese Pdf, 2.2 MB) 

l          沒有日冕的日全食 (Chinese Word, 1.4 MB)

l          日全食小統計 (Chinese Word, 0.5 MB)

l          創造和矛盾 (2009.10.03 中秋節)

l          Leonids2009_Forecast_Observation.doc (Chinese Word, 600KB)

l          冬至的意義 (2009.12.22 Chinese Word, 80KB)

l          三個關於月球的謠傳 (Chinese Word, 100 KB)


My other stuff 情意集

l          A passion of classical performing arts, when they were not contaminated by computers. 

Movie.xls (Excel format)

Classical_CD_Video.xls (Excel format)

l          帝女花全劇唱片在1960年錄音

l          林翠、王引主演的「愛的教育」(1961)

l          有情還是無情 (2006.07.13)

l          忘年君莫笑重拾赤子心 (2006.10.08)

l          The Dingdong of HK Star Ferry, 1959 (1.6MB, Windows Media Player format)

l          真人真事 --- 主僕之間的真愛 (2006.11.23)

l          A diary --- 偷得浮生半日閒 (bilingual, 2006.12.09) 

l          恭喜恭喜 (2007 Feb)

l          周璇和月亮 

l          Lanterns in NW-Hotel, 1979 (reprocessed)

l          和天有關的詩詞 (2007.03.30)

l          戴文賽先生 (2007.04.03)

l          乘風破浪獅子山下 (2007.06.21) 

l          My first telescope  (2007.06.28)

l          New Zealand Trip (2008 July, Powerpoint with 120+ slides, 38 MB) 

l          The Seekers / Judith Durham video collection  (2008 Sept) 

l          《紅雪蓮》和蘇格蘭民謠 (2008 Sept) 

l          Beethoven Virus《貝多芬病毒》 (2008 Sept) 

l          兩首猶太民謠 Donna Donna & Hava Nagila (2008 Sept) 

l          幾首源自日本的中文金曲:如我是浮雲藍月亮故鄉的雨飄雪 (2008 Sept)

l          聽收音機長大的人 (2008 Oct)

l          歌星張露 (2009 Jan)