General Astronomy Sites
+ Simulations & animations (University of Nebraska-Lincoln)
Reference
+ Cosmos Astronomy Encyclopedia
+ ISS Observation Info for NYC
+ Space Images (The Planetary Society)
+ Earthsky
+ Bruce Betts' Online Astronomy Course
+ Mooncalc.org (azimuth & altitude data)
Videos
+ Intro to Astronomy (Crash Course)
+ Formation of the Solar System
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Earth's Dimensions
Videos
+ How Eratosthenes calculated the Earth's circumference
+ Top 10 Reasons Why We Know the Earth is Round
Reference
+ Where did Earth's water come from?
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Rotation & Revolution
Interactive
Videos
+ How to find the North Pole Star; Polaris
+ Circumpolar Stars & Locating Polaris
+ Rotation of the planets (to scale)
Reference
+ Earth's Motions HMX
Sun's Path & Seasons
Interactive
+ Sun's Path Simulator (New)
+ Apparent Path of the Sun GIFs (iPad compaitable)
+ Sun's Path/Seasons (Simple)
Videos
+ Why December has the Longest Days
Reference
+ Earth's Motions HMX
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Solar System & Orbits
+ Astronomy Workshop (Solar system viewer, etc)
Videos
+ What Has New Horizons Taught Us About Pluto?
+ Russian Meteor Sonic Boom Explosion Compilation
+ Solar System Formation
+ Rotation of the planets (to scale)
+ Formation of the Planets (Nebular hypothesis)
+ Gravity - From Newton to Einstein
+ Inverse Square Law (of Gravity)
+ Space Rocks (asteroids, comets, meteoroids)
Reference
+ The Solar System HMX
+ From Pluto to the Sun: A Field Guide to the Solar System
Earth's Moon
+ Tides Simulator (with force vectors)
Videos
+ Tidal Locking: Why do we see only one side of the Moon?
+ Synchronous Rotation of the Moon
+ Total Lunar Eclipse in One Minute
+ The Moon's Inclination & Eclipses
+ Does The Moon Really Orbit The Earth?
+ Darkside (view all sides of the Moon)
Reference
+ The Moon HMX
+ Tides & Currents (Real time data)
+ Does the Moon look the same in different countries?
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Stars
Interactive
+ Elements and Spectral Analysis
+ The Sun at different Wavelengths
Videos
+ Creating Elements from "Nothing"
+ The Elements: Forged in Stars
+ Where Does The Sun Get Its Energy?
+ Where does the Sun get its Energy (Fusion)
+ Oldest Galaxy Ever Discovered
+ Picture of the Big Bang (CMB)
+ Big Bang, Cosmology: Crash Course Part 1
+ Beyond the Big Bang (1 hour 30 mins)
+ Betelgeuse Star Supernova View from Earth
Reference
+ Galaxies & Stars HMX
+ Sunspots
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The Universe
Videos
+ Stephen Hawking - The Expanding Universe
+ Measuring Gravitational Waves (LIGO)
+ Milky Way - Andromeda Collision
+ The Absurdity of Detecting Gravitational Waves
Reference
+ The Universe HMX
+ Astronomical Calendars