European Science & Technology Week 2004Visit the websites of the VT-2004 organisers
European Southern Observatory (ESO)European Association for Astronomy Education (EAAE) Observatoire de ParisInstitut de Mécanique Céleste et de Calcul des Éphémérides (IMCCE)Astronomical Institute of the Academy of Sciences of the Czech Republic

The Venus Transit 2004

... a Unique Opportunity for Amateur Astronomers


VT-2004 Observing Campaign

  Join the VT-2004 Observing Campaign!

Safety First!

  Safety First!

Photo Archive

  Contribute to the Photo Archive!

Where is the Venus Transit Visible?

  Where is the Venus Transit Visible?

The VT-2004 Network

  Join the VT-2004 Network!

Animations and Videos

  Animations and Videos


The Venus Transit on Tuesday, June 8, 2004 presents a unique opportunity for amateur astronomers: Weather permitting you will be able to:

  • observe a celestial event which no human being living on Earth today has ever witnessed
  • follow in the footsteps of professional astronomers of past centuries who attempted to determine the absolute scale of the Universe
  • test your observational skills and provide observation data for a unique experiment
  • help your fellow citizens to become aware of and safely observe this extremely rare event.

The VT-2004 website helps you to enjoy this event even more, by providing you with information and possibilities for active participation, in particular in the VT-2004 Observing Campaign .

A meeting of amateur astronomers from many different countries and the VT-2004 organisers took place at Brandys nad Labem in the Czech Republic (May 7-9, 2004). It served to discuss organisational and technical details around the planned activities by amateur groups. Much useful information is available in the presentations given at this conference (most as PPT), available here.

One word of caution: never forget to follow the Safety Instructions! Be especially careful if there are persons in your observing group or in the surrounding public who may not be aware of the critical danger for the eyes if they attempt to look towards the Sun without adequate protection! This is particular so for children and young people! Be sure to instruct everybody around you about this!

Useful areas at this website

The VT-2004 website has been designed in order to provide the broadest possible information about the Venus transit. Here are some the areas that may be particularly useful for amateur astronomers:

  • You will find a wealth of information on all aspects of the transit in the Extended InfoSheets , from details on how to calculate the Astronomical Unit accurately from your observations to a discussion on the detectability of extrasolar planets transiting in front of their stars.
  • You will also find useful information to help you to prepare and perform your own observations , including specific "Guidelines for Observers" and "Timing Hints" with an internet-based PC-stopwatch to facilitate your work.
  • You are invited to enter your contact timings into the world-wide database; it will also be possible for you to calculate a value for the Astronomical Unit based on your own observaitons. To do so, you will need to register with the VT-2004 Observing Campaign.
  • Basic Image Processing - available to everybody! Digital images frequently contain more information than is obvious at first glance. We want to help you in getting the most out of your digital camera images. We have therefore created an easy-to-use facility at the Ondrejov Observatory (The Czech Republic) where you may submit your images and have a variety of well documented operations performed on them. The results are immediately displayed on your screen.
  • You may find it useful to discuss the details of your planned observations, the optimum tuning of your equipment or the mysteries of the "Black Drop" effect with fellow amateurs from all over the world in the VT-2004 Online Forum
  • You will find a lot of useful material that you can use in your local "public relations" activities. In particular, the Brief InfoSheets probably contain answers to almost all of the questions the general public will ask you.
  • If you are a member of an Astronomy Club or Amateur Association planning public activities on the occasion of the transit, we recommend that your group joins the international VT-2004 Network . It is strongly suggested that you enter into contact with the VT-2004 Node in your region (country) which may have useful material related to the Venus Transit in your own language.
  • Would you like to submit some of your photos to the VT-2004 Photo Archive ? This you can do at any time. Who knows, perhaps you will also see it on the top page as VT-2004 Photo of the Day !

Whatever you choose to do, we wish you much fun and not least, clear skies at the time of Venus Transit on June 8, 2004!

Information and News

This website includes a guide about the preparations before and the activities on the Day of the Transit page. And on that day, June 8th, 2004, you will be able to follow on the the web live observations of the event, as recorded with large professional and smaller amateur telescopes . A rich selection of real-time images will be available via the VT-2004 Central Display page.

Current information about the VT-2004 programme is available via the Press Communications . Until now, these have been issued:

Look also at the "Latest News" on the right side of the top page - or at the News Archive. The VT-2004 programme was introduced in ESO Press Release 03/04.


If you have questions in this context, you may contact the organisers via email at