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ce plan du site n'est qu'en langue anglaise et n'est que le plan de la partie du site en langue anglaise; pour un équivalent en français, voir à "Contenu complet de la version française simplifiée", qui donne l'essentiel du contenu de la partie française

Home Page

• Monthly Sky, News, Tutorials, Links, Space, Site Map
• see the site's instructions of use
• Events, Moon, Planets (or the monthly ephemerides)
• Editor's Choice Fine Picture, Editor's Choice Sky At
• Space, Initiation, Outdoor Packs, Tech News, Goodies, RSS Feeds
• Disclaimer, Copyright, etc.

the home page contains a link to a simplified French version, most content of which is to be found at "Contenu complet de la version française simplifiée"

Monthly Sky

• Monthly Sky Charts
     charts for mid-northern latitudes
     charts for equatorial regions
     charts for mid-southern latitudes
• 12 Months Sky Charts
• This Month Twilight, Sun, Moon
• Yearly Calendar (Planets, Minor Planets, Major Astronomical Events, Great Space Events, etc.)
• Archive

News

• News
• News Archive

Tutorials

• Observation
     FAQs
         FAQs
         Initiation, Outdoor Packs
     Naked-Eye Sky Learning
         Naked-Eye Sky Learning 1 (Northern Hemisphere)
         Naked-Eye Sky Learning 2 (Equator and Tropics)
         Naked-Eye Sky Learning 3 (Southern Hemisphere)
     Observable Objects
         Site's Webmaster Observations' Page
         Planetary Basics
         More About Mercury or Venus Evening or Morning Stars
         Observing the Moon
         Observing the Sun
         Observing a Sun Eclipse
         Observing a Moon Eclipse
         Shooting Stars
         The Belt of Venus, The Golden Hour
         Comets and Comet Hunting
         Northern Lights
         Occultations
         Variable Stars
         Binary Stars
         Asteroids and Asteroid Hunting
         Constellations Overview
         Main Stars
         Messier Objects Accessible To Binoculars and A 4.5" Newtonian Telescope
         Mars Oppositions
         Venus and Mercury Transits
         Sundials
         About the Eye's Cones and Rods in Terms of Deep Sky Objets
         Astrophotography
         What About the Pro-Am Collaboration?
         What About the Light Pollution Question?
     Tools
         How to Easily Measure Angles on the Sky
         An Easy way to Compare Magnitudes
         Greek Alphabet
         Usual Metric/Imperial-US and Fahrenheit/Celsius/Kelvin Conversion
         A Observation Session
         How to Record A Observation
         How to Tune a Classical Three-screw Telescope's Visor?
         Constellations Latin Names, Abbreviations and Genitives
         Hemispherical Sky Maps
         Celestial Mechanics Definitions List
         Keys to Soho Daily Pictures
         Usual Astronomical Measure Units
     Advanced Tools
         Julian Dates
         Time Systems
         Stars Designations
         The Invention of Southern Skies
         Limiting Magnitude
         Symbols of Planets and Zodiacal Constellations
     Instruments
         How to Choose a Telescope?
         Telescopes and Mounts
         Some Usual Formulae for Instruments
     Glossary
         Glossary
• Theory
     Introduction
         Universe: Take the Tour!
         Earth In the Universe. Where Are We?
         The History of Astronomy
         A 17th Century Attempt to Christianize The Night Sky!
         40 Years in Astronomy: Astronomy During Last 40 Years
         Some Time or Size Scales to Render the Dimensions of the Universe!
         Astronomers' Largest Tools and Sites
         Speeds in the Universe
         Temperatures in the Universe
     FAQs
         FAQs
     The Solar System
         Solar System Figures
         Solar System to Scale
         Sun
         The Sun as Seen From...
         Solar System Planets
         What If, Should you Live At...
         Moon
         The Discovery of Pluto
         Asteroids
         The Discovery of Asteroids
         Comets
         Comet Shoemaker-Levy at Jupiter
     The Solar System Advanced
         More About the Solar Wind
         Solar System Moons
         Impactors at Jupiter
         The Transition Between Two 11-Year Solar Cycles
         Some Data and Concepts About Mars
         Moon and Planetary Nomenclatures
         Planetary Geology
         Magnetospheres
         Planetary Atmospheres
         The Heliosphere
     The Earth
         Earth's Atmosphere
         Earth's Interior
         Earth's Magnetosphere
         Climate and Weather at Earth
         The Question of The Global Warming
         Clouds
         Plate Tectonics
         Hurricanes
         Lightnings
         Earth's Rocks
         Sun and Earth Climate
     Celestial Mechanics
         Seasons
         Moon's Phases
         Planets Apparent Motion
         Sun Eclipses
         Moon Eclipses
         Time-keeping: Time
         Time-keeping: Calendars
         Orbits
         Lagrangian Points
         More About Days and Nights at the Solstices and the Equinoxes
     Stars
         Stars
         Electromagnetic Spectrum, Spectroscopy
         A Transitional Species Between Neutron Star and Magnetars?
         Supernovae
         Novae
         A Example of a Millipulsar Binary
         Cepheids
     Our Milky Way Galaxy
         The Milky Way Galaxy
         Sgr A*, or the Milky Way Galaxy Center
         The Case of The Collision Between our Milky Way Galaxy and the Andromeda Galaxy
     Galaxies
         Galaxies
         What Black Holes Are
         Globular Clusters
         Galaxy Clusters and The Web Universe
         Neutrinos
         Cosmic Rays
         A Example of a Close Active Galaxy With the Famed Centaurus A Galaxy
         Gravitational Lensing
         The IR Hubble Ultra Deep Field (HUDF)
     Cosmology
         A Current View of the Universe
         How Is Matter Distributed in Universe?
         Inflation Theory Detailed
         Philosophy in Cosmology
         Matter and Antimatter
         Philosophy-Friendly? Check This!
     Life in the Universe
         Life in the Universe
         Intelligence in the Universe
         What About UFOs?
         Interstellar Medium DIBs
     Advanced Studies in Astronomy
         About NEOs
         The Kuiper Belt Objects
         About Exoplanets
         Gamma-Ray Bursts (GRBs)
         Personal Reflexion About the First Moments of the Universe
         What the Force of Gravity is
         For the Braves of Heart: The Potential Threats to Earth from the Universe!
     Glossary
         Glossary
     Some Science Extras
         Einstein's Relativity
         Standard Model of Physics
         Overview of an Atom
         Periodic Table of the Elements
         Quantum Theory
         Geologic Eras at Earth
         An Overview of the History of Man

Links

• Links

Space

• Tutorials
     Introduction
         60 Years of Space Conquest
         NASA Organizational Structure
         NASA Field Centers
         The Jet Propulsion Laboratory
         The New U.S. Space Program
         The ISS
         China Manned Space Program
         Earth Science in Space Age
         The European Space Agency (ESA)
     FAQs
         FAQs
     Launch Facilities, Launchers
         U.S. Launch Facilities
         Non-U.S. Launch Facilities
         The United Launch Alliance Venture
         Launchers by Countries
         Description of A Launcher
     Flight Techniques
         A Mission Countdown
         A Space Shuttle Mission Countdown
         How a Launch Team is Working
         How Does the ISS Flight Control Room in Houston Work?
         Terrestrial and Interplanetary Orbits
         Earth's Orbit and Planetary Missions Maneuvers
         How Does a Soyuz TMA Come Back From the ISS?
         Spacewalks
         Lagrangian Points
     Procedures
         A Space Mission From Project to Launch
         The Flight Design Process
         A Mission Pre-Launch Sequence
         A Planetary Probe Specs and Science Instruments
         A Weather Satellite in Details
         NASA Communication Systems
         Downlink Sessions
         Picture Processes
         From Selection to Mission. NASA Astronauts
• Historical Missions and Programs
         Planetary and Moon Missions Database (1957-Now)
         Project Mercury: First US Manned Space Flights
         The Gemini Program: From Mercury to Apollo
         Lunar Pioneers of the Pioneer Program
         Apollo Program: Man on Moon
         Soviet Endeavours to The Moon
         The Space Shuttle
         The Soviet Lunokhods
         Soviet and Russian Space Stations
         The U.S. Manned Orbiting Laboratory (MOL)
         Pioneer 10 and 11: First missions to Jupiter and Saturn
         The Skylab
         The July 1975 Apollo-Soyuz Encounter
         Missions to Venus
         Mariner 10 at Mercury
         Missions to Mars
         Voyager 1 and 2: Grand Tour of Gas Giants and Headed for the Stars
         Galileo: Jupiter and the Galilean Satellites
         MESSENGER: Mercury 30 Years After Mariner 10
         Cassini-Huygens: In the Saturnian System