Solar Images from SDAC
Daily pictures from the SOHO and Yohkoh space platforms, the US National Solar Observatory, and the Mauna Loa Solar Observatory.
http://umbra.nascom.nasa.gov/images/latest.html

Cosmic and Heliospheric Learning Center
Based at NASA/GSFC. Includes sections about the Sun, the cosmic rays and the history of its study.
http://helios.gsfc.nasa.gov/

The Sun: a Pictorial Introduction
A college-level survey of the star, with slide set of 20 images.
http://www.hao.ucar.edu/public/education/slides/slides.html

Sun Position Calculator
Calculates Sun azimuth and altitude for a given location and date.
http://www.geocities.com/senol_gulgonul/sun/

Stanford Solar Center
Presents a collection of educational activities based on Solar Oscillations Investigation (SOI) and Solar and Heliospheric Observatory (SOHO) data.
http://solar-center.stanford.edu/

Birmingham Solar Oscillations Network
Who they are and what they do. Also includes background information, results, data.
http://bison.ph.bham.ac.uk/

The Nine Planets: Sun
General information, some statistical data and links.
http://www.seds.org/billa/tnp/sol.html

YPOP Tour of the Sun
Educational information about the Sun.
http://www.lmsal.com/YPOP/Spotlight/Tour/index.html

The Virtual Sun
Virtual tour of the sun which uses images, diagrams, and movies to illustrate subjects such as solar wind, solar flares, the solar surface and sunspots.
http://www.michielb.nl/sun/kaft.htm

How Stuff Works: Sun
In-depth illustrated description of the Sun, its surface, atmosphere, sunspots, solar prominences and solar flares.
http://www.howstuffworks.com/sun.htm

Views of the Solar System: Sun
Pictures, animations, general information and data.
http://www.solarviews.com/eng/sun.htm

AAS Solar Physics Division
[Greenbelt, Md] Members, organization, news, meetings, contacts.
http://umbra.nascom.nasa.gov/aas_spd/

Analemma
Explains what it is, also with a few simple animations.
http://www.analemma.com/

NASA/Marshall Solar Physics
The Solar Physics Branch of Marshall Space Flight Center's (MSFC) Space Sciences Laboratory (SSL) is composed of 15 scientists involved in various studies of the physics of the Sun.
http://science.nasa.gov/ssl/PAD/SOLAR/default.htm

The Solar System in Action: Sun
General information about the star presented in a popular language.
http://www.harmsy.freeuk.com/sun.html

World Book: Sun
Basic features and facts.
http://www2.worldbook.com/features/features.asp?feature=sun&page=html/intro.htm&direct=no

Windows to the Univers: Sun
Overview including general information, data, pictures, news, historical and mythological background.
http://www.windows.ucar.edu/cgi-bin/tour.cgi?link=/sun/sun.html

The Virtual Sun
A virtual tour with basic information. Some movies also available.
http://www.astro.uva.nl/demo/sun/

The Sun is a Ball of Iron
Dr. Oliver K. Manuel's posits a new theory of the sun's formation, composition and energy production.
http://www.thesunisiron.com

Solar Orbit
The site describes the solar orbit and consequences which result out of this movement of the sun. Detailed description and downloadable program allow you to investigate further details.
http://www.sunorbit.net/

Current Solar Data
An unofficial archive of NOAA GOES solar data.
http://www.maj.com

The Analemma Project
An analemma photograph is featured with a detailed description of how it was created.
http://www.steveirvine.com/analemma.html

The Inconstant Sun
From NASA Science News, experiment on board shuttle mission STS-107 is monitoring the Sun's variable brightness and its link to terrestrial climate change.
http://science.nasa.gov/headlines/y2003/17jan_solcon.htm?list93257