What are orbits and eclipses?

• What is an orbit? (NASA)
• What causes an orbit to happen? (Qualitative Reasoning Group)
• What is orbital mechanics? (Rocket & Space Technology)
• Orbital mechanics I (The Physics Hypertextbook)
• Heliocentrism from the Greeks to Copernicus & after (Wikipedia)
• Copernicus (Biography)
• Galileo & the controversy that moons orbited Jupiter (Wikipedia)
• Modern flat Earth societies (Wikipedia)
• The middle ages (History)
• What is the heliocentric model of the universe? (Universe Today)
• From geocentrism to heliocentrism (Futurism)
• Live tracking: Where is Halley's comet now? (The Sky Live)
• Comet trajectories: Where is Halley's comet (The Planets Today)
• Halley's comet completes an elliptical orbit around the sun every ~76 years (Wikipedia)
• Planets & stars orbit around their common centre of mass, the 'barycentre' (NASA)
• Lagrange points: Parking places in space (Space)
• Kepler's laws (One-Minute Astronomer)
• Planetary motion: The history of an idea that launched the scientific revolution (NASA)
• Does our galaxy orbit anything? (Astroquizzical)
• How do gravitational slingshots work? (Universe Today)
• Gravitational slingshot (Math Pages)
• Voyager 1 & 2 spacecraft flight paths (Vimeo)
• Voyager 1 slingshot & other probes (Wikipedia)
• Do unmanned spacecraft like Voyager travel in straight lines? (Ask An Astronomer)
• What is a gravity well? (Qualitative Reasoning Group)
• Gravity wells scaled to Earth surface gravity (xkcd)
• Voyagers 1 & 2 do have thrusters (NASA)
• The Farthest: The documentary about the Voyagers we mentioned (IMDb)
• Energy relationships for satellites (The Physics Classroom)
• Why doesn't the Moon fall upon Earth? (Physics Stack Exchange)
• Why the Moon is getting further away from Earth (BBC)
• Is the Moon moving away from Earth? (Ask An Astronomer)
• Outer space is not a perfect vaccuum (Wikipedia)
• How are satellites launched into orbit? (Astronomy WA)
• The different types of orbits of satellites (Wikipedia)
• One of many satellite finder apps (iTunes)
• Does zero gravity exist in space? (Yale Scientific)
• NASA's vomit comet trains astronauts in the ways of weightlessness (Gizmodo)
• Feeling weightless in an elevator if the cable breaks (Hyperphysics)
• What is the difference between weight & mass? (Thought Co.)
• What is an eclipse? (NASA)
• Eclipse (Wikipedia)
• Solar eclipse of August 21, 2017 (Wikipedia)
• What science can learn from a total solar eclipse (Cosmos)
• Here's what scientists have learned from total solar eclipses (Space)
• How are total solar eclipses used by scientists? (NASA)
• Why a total solar eclipse is such a big deal (YouTube)
• Two minutes of darkness with 20,000 strangers (FiveThirtyEight)
• 2 July, 2019 is the next total solar eclipse (Time And Date)
• The Moon's orbit & rotation (Windows 2 Universe)
• Diagram showing the Earth-Moon system (Wikipedia)
• Why future Earthlings won't see total eclipses (NPR)
• Perihelion & aphelion (Wikipedia)
• Types of solar eclipse: Partial, annular, total & hybrid (National University of Singapore)
• The diamond ring effect during a toal solar eclipse (Wikipedia)
• Solar eclipse of January 24, 1925 in New York City (Wikipedia)
• What is the umbra? (Time And Date)
• Scientists to take flight for longer views of the eclipse (The New York Times)
• Chasing the total solar eclipse from NASA’s WB-57F jets (NASA)
• When astronomers chased a total eclipse in a Concorde (Motherboard)
• NASA's best photos of the total solar eclipse of 2017 (Space)
• The Sun's diameter is ~1.392 million km (Space)
• The Sun's corona extends millions of kilometres into space (Wikipedia)
• How do computers predict eclipses? (NASA)
• What do Flat-Earthers think is going on during a solar eclipse? (IFL Science)
• Where are you from? Send us a postcard! Strange Attractor, c/ PO Box 9, Fitzroy, VIC 3065, Australia

Corrections

• Gravity assist owes both Kepler & Newton (The Science Classroom)