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• Introduction
• 1) Celestial Sphere 
• 2) Celestial Sphere
• 3) Earth Horizon
• 4) Angular Measurment
• 5) Using your hand
• 6) Locating Polaris
• 7) Big Dipper
• 8) Altitude
• 9) Asimuth
• 10) Earth Wobble 
• 11) Geocentric Model
• 12) Zodiac: Heleocentric Model

• Introduction to the Night Sky
• 1) Sun in Ecliptic 
• 2) Parallax
• 3) Parallax
• 4) Solar verses Sidereal day 
• 5) Seasons
• 6) Causes of Seasons**
• 7) Seasons and Sunlight 
• 8) Observing yearly motion of Sun at Noon
• 9) Retrograde Motion (Scientific explanation with animation)
• 10) Retrograde Motion with animation
• 11) Retrograde Motion (Scientific explanation)
• 12) Retrograde Motion(Ancient explanation)
• 13) Eclipse of Venus (Scientific explanation)
• 14) Eclipse of Venus (Scientific explanation)
• 15) Eclipse of Venus (Ancient explanation) 
• 16) Coriolis Effect Caused by Earth's rotation 

• Keple's laws
• 1) Kepler's first, second and the third law
• 2) Kepler's Laws of Planetary Motion
• 3) Kepler's third law
• 4) Kepler's second law
• 5) Kepler's law
• 6) Kepler's three laws My favorite
• 7) Orbit simulator
• 8) Click to see the animations Universe by W. H Freeman 
• 9) Click to see the Interactive Exercises Universe by W. H. Freeman

• Gravity and Motion
• 1) Atoms
• 2) Motion  
• 2) Acceleration
• 3) Centripetal force
• 4) Free Fall
• 5) Newton's three laws 
• 6) Newton's third law
• 7) Gravity
• 8) Free Fall lab
• 9) Weightlessness
• 10) Astronauts simulate Zero g
• 11) Acceleration due To Gravity plus dropping a hammer and a feather on the Moon 

• Light and Atom, Animations
• 1) What are electromagnetic waves
• 2) Electromagnetic wave propagation
• 3) Electromagnetic waves
• 4) Wave amplitude
• 5) Doppler effect.(Best) animation
• 6) Doppler effect with sound
• 7) An example of Doppler effect
• 8) Doppler effect
• 9) Bohr's Model for Hyrogen Atom
• 10) Absorption and emission of radiation by an atom
• 11) Atomic absorption
• 12) Wien's and Stefan Laws
• 13) Wien's Law
• 14) STEFAN-BOLTZMANN LAW

• Telescope. Short Lectures, Animations
• 1) Optical Telescopes

• The Solar System. Short Lectures
• 1) Earth, Mercury, Venus, Earth, Mars, Jupiter, Saturrn,, Uranus, Neptune, Pluto. Comet
• 2) Planets with video and audio

• The Moon
• 1) Moon's motion and phases 
• 2) Sidereal and Synodic Month
• 3) Moon tilt orbit 
• 4) Total, Partial and Annular Eclipses 
• 3) Total Lunar Eclipse
• 6) Total Solar Eclipse movie 
• 7) Total Solar Eclipse animation
• 8) Eclipses
• 9) Lunar Eclipses , Umbra and Penumbra 
• 10) Moon face toward Earth
• 11) Earth-Moon Tides

• Fusion
• Fusion in the Sun

• Parallax
• Stellar Parallax
•  

• Binary Sysem
• Eclipsing Binaries
• Orbiting Binary System

• Stellar Evolution

Helpful WWW Sites

• Scientific Notation
• Power of 10
• Power of 10
• Notation, Conversion, Weights & Measures
• Calculating Angles in Sky
• Sun Angle
• Astronomical Distances (and the time it takes to get there)
• Basic Geometry
• Scientific Method
• What is the " Scientific Method"?
• Sky Tonight
• Your Sky (Excellent site for a sky map)
• Every Night Sky
• Constellation Photos
• Constellations (by month)
• Constellation Quiz
• Monthly star charts
• Astronomical pronunciation Guide-1
• Astronomical pronunciation Guide-2
• TheTides. page 1
• TheTides. page 2

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