The origin and use of Latitude and Longitude (HD)
| Media File | YouTube Link |
The origin and use of the Horizon System (HD)
| Media File | YouTube Link |
The origin and use of the Equatorial System (HD)
| Media File | YouTube Link |
The origin and use of Latitude and Longitude
| Media File | YouTube Link |
The origin and use of the Horizon System
| Media File | YouTube Link |
The origin and use of the Equatorial System
| Media File | YouTube Link |
The Celestial Sphere
| Media File | YouTube Link |
Earth's Orbital Motion and the Sun's Motion Across the Celestial Sphere
| Media File | YouTube Link |
The Diurnal Motion of the Stars Created by the Rotation of the Earth
| Media File | YouTube Link |
A Simple Demonstration of Parallax
| Media File | YouTube Link |
Stellar Parallax and the Celestial Sphere: Changing Appearance of Constellations From Earth's Motion
| Media File | YouTube Link |
Exaggerated Stellar Parallax: the Apparent Motion of Stars due to Earth's Orbital Motion
| Media File | YouTube Link |
Using a Gnomon's Shadow to track the motion of the Sun
| Media File | YouTube Link |
Seasonal Variation of a Gnomon's Shadow
| Media File | YouTube Link |
Why Solar Eclipses Happen
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Why Solar Eclipses Don't Happen Every Month
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Why Solar Eclipses Happen (redone)
| Media File | YouTube Link |
Why Solar Eclipses Don't Happen Every Month (redone)
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The geometry of solar and lunar eclipses
| Media File | YouTube Link |
The Earth and Moon Orbit Each Other as they Orbit the Sun (not to scale!)
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The Moon's Path around the Sun (object size exaggerated)
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Seasons
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Orbital Elements: Describing an Orbit About the Sun in 3D (HD)
| Media File | YouTube Link |
Orbital Elements: Describing an Orbit About the Sun in 3D
| Media File | YouTube Link |
Tidal Effects on a Planet and Satellite
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Spring and Neap Tides on the Earth
| Media File | YouTube Link |
Ptolemy's Model for a Superior Planet
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Ptolemy's Model for an Inferior Planet
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Copernicus's Model for a Superior Planet
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Copernicus's Model for an Inferior Planet
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Copernicus's Model and the Phases of Venus
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Ptolemy's Model and the Phases of Venus
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Kepler's First Law
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Kepler's Second Law
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Kepler's Second Law (updated)
| Media File | YouTube Link |
Rotation Curve for Our Solar System
| Media File | YouTube Link |
Rotation Curve for a Galaxy and the Wind Up Dilemma
| Media File | YouTube Link |
Density Waves and the Stability of Galactic Spiral Arms (Artist Conception)
| Media File | YouTube Link |
Hypothetical Rotation Curve for a ""Uniform Ball"" of Stars
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A Perspective of Earth's Moon
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Relative Size of the Planets
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A Cloudless Perspective of Venus Based Upon Radar Data
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A Perspective of Mars
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3-D map of Asteroids (astorb.dat from Bowell@Lowell)
| Media File | YouTube Link |
Ringworld Fly-By: Hypothetical Construct of an Arbitrarily Advanced Civilization (large)
| Media File | YouTube Link |
Pulsar: A Spinning Neutron Star with Beamed Radio Emission
| Media File |
Pulsar: A Spinning Neutron Star with Beamed Radio Emission (revised)
| Media File | YouTube Link |
Pulsar: A Spinning Neutron Star with Beamed Radio Emission (revised and extended)
| Media File | YouTube Link |
Eclipsing Binary
| Media File |
Eclipsing Binary II
| Media File | YouTube Link |
Spectroscopic Binary
| Media File |
Anatomy of an Active Galactic Nucleus
| Media File | YouTube Link |
Twisted Magnetic Fields Driving Galactic Jets
| Media File | YouTube Link |
Mass Transfer in a close Binary Star System
| Media File | YouTube Link |
Compact Stars and Gravitational Wells
| Media File | YouTube Link |
Equivalence Principle: Accelerating in Space vs. Remaining Stationary in Gravity
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Equivalence Principle: Stationary in Space vs. Freefall in Gravity
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Expansion of the Universe and Red Shift of Cosmic Background Radiation
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Expansion of the Universe and Wavelength Red Shift
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Hubble's Law: Red Shift/Distance and Cosmological Expansion
| Media File | YouTube Link |
Sending Signals Across Vast Distances and the Expansion of the Universe
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Curvature and the Bending of Geodesic Paths (HD)
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Geodesics and Positive Curvature (HD)
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Geodesics and Negative Curvature (HD)
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Geodesics and Zero Curvature (HD)
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Geodesics and Positive Curvature
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Geodesics and Negative Curvature
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Geodesics and Zero Curvature
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Gravitational Lensing of Light
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Frame Dragging and the Lense-Thirring effect
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Gravitational Wave and Polarization
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Linear Polarized Gravitational Wave
| Media File | YouTube Link |
Elliptically Polarized Gravitational Wave
| Media File | YouTube Link |
Disk Formation in Collapsing Cloud
| Media File | YouTube Link |