Spaceship Earth HD ➤ EPISODE 2 - Earth's Rotation: What is day? What is night?

Follow the Earth's journey through its 52-episode orbit over the 52 weeks of an Earth year and understand our planet's relationship with the sun, the stars, and the events of the universe. Episode Guide: Week 1 – Earth's Orbit around the Sun: Location of Venus Week 2 – Earth's Rotation: What is Day? What is Night? Week 3 – Moon's Orbit: Hypotheses about the Moon's Formation Week 4 – Mercury's Orbit: Satellites of the Planets in the Solar System Week 5 – Where is Mars? How and Why Does the Earth Rotate? Week 6 – The Orbits of the Planets in the Solar System: How Week 7 – Gravitational System: The Earth's Axis Week 8 – The Stars: The North Star Week 9 – Leap Year: Calendar Basics Week 10 – Earth-Moon-Sun Alignment: Planets Hidden by the Sun Week 11 – Solar Eclipse: Total Solar Eclipse Week 12 – Equinox and High Tides: Earth-Mars-Sun Alignment Week 13 – The Inconsistent Dates of Easter and Spring: Dividing the Globe into Time Zones Week 14 – The Sun and Saturn: The Constellation of Orion Week 15 – The Tilted Axis of the Earth: Comets Week 16 – The Julian and Gregorian Calendars: The Earth and Orion Week 17 – Gravitational Balance: How The Moon Helps Earth Week 18 – Neptune and Pluto Week 19 – The Stars as a Reference for Time and Space: Clock and Compass? Week 20 – Jupiter: Four Satellites of Jupiter Week 21 – Getting to Know Mercury: Copernicus's Vision Week 22 – The Moon and the Planets: Inaccessible Stars Week 23 – The Mysteries of Uranus: Discovering Neptune Week 24 – Looking at Earth from Space: The Geography of the Solar System Week 25 – How Did the Sun Form? The Sun and Its Characteristics Week 26 – How the Solstice Occurs at the South Pole: The Moon of the Sun Week 27 – Earth Far from the Sun: The Eclipse of the Century Week 28 – All About Venus: Planet Alignment Week 29 – The Earth's Curvature: Why is the Setting Sun Red? Week 30 – Heat on Earth: Ozone: Northern Lights Week 31 – The Milky Way: Our Path in Space Week 32 – The First Photo of Earth: Earth's Atmosphere Week 33 – Shooting Stars: The Front of Earth Week 34 – The Moon and the Tides: Jupiter Shines Week 35 – Measuring Time and Space: Earth as a Reference Point Week 36 – Partial Solar Eclipse: Black Hole Week 37 – Pluto: Planet, Asteroid, or Moon? Uranus, Days and Nights of Forty-Two Years Week 38 – Earth's Shadow: The Red Moon Week 39 – What is an Equinox? 22-Hour Days Week 40 – Why Are We in Orbit? The Moon is moving away from Earth Week 41 – Secrets of the Moon: Reading the Moon Week 42 – Why are Planets Named That Way? Venus and the Full Moon: An Unlikely Pair Week 43 – The Giant Jupiter: The Failed Sun Week 44 – Daylight Saving Time: Earth's Journey Week 45 – References for Observations: The True Movement of the Moon Week 46 – Saturn and its Rings: The Gas Giant Week 47 – Life Beyond Earth: Did Life Exist on Mars? Week 48 – Twilight and its Characteristics: How to Distinguish Sirius from Venus? Week 49 – How are the Stars Connected? Venus Rotates in the Opposite Direction Week 50 – In Which Direction is the Earth Moving? Why Does Night Exist? Week 51 – In the Earth's Shadow: Warming and Freezing Week 52 – Hypotheses about the Natal Star: Giotto's Record