Astronomy Online

This Astronomy On-Line Shop invites you to participate actively in a number of special projects which require real observations by as many of the Participating Groups as possible, located over the widest possible geographical area.

By comparing such observations of the same phenomenon or object, joint results will be obtained which will provide very useful and interesting information, not easily obtainable by other means.

One more collaborative project is about to be added, a somewhat easier one that will compare the degree of light pollution at the geographical locations of the participants.

In order to learn more about these projects and how to participate in them, you must click on the corresponding icons. Some of the images in the texts are also active. If you click on them, you will get a larger image, but remember that it also will take a longer time to download them (the amount of kilobytes is indicated).

Solar Eclipse

On Wednesday, August 11, 1999, a relatively rare phenomenon will occur: a Total Solar Eclipse. This event will be visible, first from the southernmost part of the United Kingdom, and then Belgium, Luxembourg, France, Germany, Austria, Hungary, Romania, the Black Sea, Turkey, and onwards into Asia.

 [NEW] A major collaborative programme around this solar eclipse is being organised on this occasion by EAAE. There will be many different activities and you will be able to follow the eclipse on the web.

Click on the icon and learn a lot about solar eclipses and how to observe them without an risk. Find out about the motion of the shadow across Europe and when the eclipse happens in different places! And check out the many weblinks available within this programme!

Lunar Eclipses

Collaborative programmes have been arranged in the connection with Total Lunar Eclipses in September 1996 and September 1997. Join these programmes and learn more about the eclipses.

The first Results from the observations by Astronomy On-Line Groups of the 1996 eclipse are available!

Sun-Earth Relations

Already from early October 1996, Astronomy On-Line Groups in Central and Southern Europe have been observing the Sun, looking for sunspots, maybe flares - and making a daily sketch of the solar surface seen on a projected telescope image. But NOTE: Never look directly at the Sun through a telescope!. Groups in Northern Europe have made observations of variations in the Earth's magnetic field and of the beautiful aurorae which are often visible there. Together, these observations will make it possible for students to study actively the relationship between the Sun and the Earth. Watch how the changes on the Sun may later be registered at the Earth, when the fast particles of the solar wind have travelled the distance!

This is one of the most ambitious Collaborative Projects and it needs the active participation of many Groups to succeed. So if you are interested in these matters, do not hesitate to join! You will find full instructions when you click on the icon to the left.

The Size of the Earth

Measure the Size of the Earth, together with another Astronomy On-Line Group! Repeat the old measurement by Erathostenes and see how close you will get to the correct result. Here is the most'classical' of all collaborative projects with detailed explanations and a historical review of the method!

Final Report now available.

The Distance to the Sun

Join other groups to attempt the first-ever determination of the distance to the Sun by school students! Please note, however, that this is a somewhat difficult project which requires good observational equipment.

But even if you cannot make the necessary observations yourself, you may be interested in following the developments and see the images from which this determination will be made.

Catch a Shooting Star

Observe the Leonid meteor shower in mid-November and compare your observations with those of many other groups! Learn a lot about meteors, meteorites and try the links to the most important related WWW-sites!

Light Pollution

Measure the amount of light pollution in your city. Compare your observations with those from many other cities so that we can produce a map of this unpleasent effect!.

Variable Stars

The sky is full of variable stars and many of them are regularly observed by professional and amateur astronomers. This project will give you the chance to contribute actively to such observations, by making your own brightness estimates of one or more selected objects!

Comet Hale-Bopp

Coordinated observations of Comet Hale-Bopp and lots in interesting features around this very unusual object. Will it become one of the brightest comets in this century?

Note also the information available at the special ESO Comet Hale-Bopp Homepage.

Solar Eclipse

On Saturday, October 12, 1996, a relatively rare phenomenon occurred: a Partial Solar Eclipse. This event was visible from Northern Canada, all of Europe and Northern Africa. Note the Special Bulletin with all related links.

A provisional report about the solar eclipse results is now available. Based on the observations of participants all over Europe, the distance to the Moon was determined with an accuracy of better than 5 percent! Latest updated report with images and links to other sites is from November 11 (in HTML format). A report about the 3-D results is also available (November 20).

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