Top Sites

The top ranked sites in each category. Many listings in Top Sites by Category are for specific pages or subdirectories, not for entire sites. For example, in the Reference > Maps section you'll find mapquest.com (an entire site about maps) and maps.yahoo.com (one section about maps on a larger site).

For this reason, the listings in the Top Sites by Category are ordered by Popularity of this listing, and not by the overall Traffic Rank of the site. We use the same basic traffic ranking technology used for Alexa Traffic Rank — a combination of users and page views — but apply it only to the traffic for that specific listing. To find out the Traffic Rank of any site in the Top Sites by Category directory, just click the name of the site and you'll be taken to the "Site Info" page for that site.

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Top Sites in:

• 1

  Transit of Venus

  transitofvenus.org

  Safety, viewing techniques, FAQ, and historic expeditions pertaining to this June 8, 2004 event..
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• 2

  Telescopes Aim at Mercury

  news.bbc.co.uk/1/hi/sci/tech/2994347.stm

  BBC News article anticipating the 2003 transit.
  • 4.0 Stars
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• 3

  Planetary Transits Across the Sun

  sunearth.gsfc.nasa.gov/eclipse/transit/transit.html

  NASA/Goddard page with explanations and photographs. Includes detailed information about upcomi... Moreng events and some history.
  • 5.0 Stars
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• 4

  Sun-Earth Day 2004 Venus Transit

  sunearth.gsfc.nasa.gov/sunearthday/2004/index_vthome.htm

  Information and resources for students, educators, museums, scientists and amateur astronomers.... More Animations, facts, graphs, maps, historical articles, and pointers to webcasts and other ways to view the transit.
  • 5.0 Stars
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• 5

  Transit of Venus, 2004

  aa.usno.navy.mil/data/docs/Venus2004.pdf

  A table showing predicted time and path of the transit for various locations throughout the wor... Moreld. From the US Naval Observatory.
  • 4.0 Stars
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• 6

  Orpington Astronomical Society - Transit of Venus 2004

  chocky.demon.co.uk/oas/venus.html

  Description of the event, explanation of timing, illustrations including "black drop effect".
  • 3.0 Stars
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• 7

  Transits of Mercury and Venus

  rasnz.org.nz/Transits.htm

  Brief description of the upcoming transits, with information about visibility in Australia and ... MoreNew Zealand.
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• 8

  Transit of Mercury, May 2003

  home.freeuk.com/dgstrange/transit.mercury.2003/

  This site will contain live images of the transit of Mercury across the face of the Sun as reco... Morerded at Worth Hill Observatory in May 2003.
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• 9

  Venus Transit 2004

  vt-2004.org

  Describes the VT-2004 project that is related to this celestial event and which aims at transfo... Morerming curiosity into knowledge and interest in science through a broad set of actions. It has been launched by the European Southern Observatory (ESO) and the European Association for Astronomy Education (EAAE), together with the Institut de Mécanique Céleste et de Calcul des Éphémérides (IMCCE) and the Observatoire de Paris in France, as well as the Astronomical Institute of the Academy of Sciences of the Czech Republic.
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• 10

  The Next Transits of Venus

  astronomy.org.gg/venustransitsa.htm

  Brief description with diagrams of the 2004 and 2012 transits as seen from Guernsey.
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