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)
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Corrections

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

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