Terra: Earth to Scale

Terra shows facts about our planet the way they really are: on an interactive 3D globe, at true proportions, with real data behind every number. Put any scene in your room with AR at a scale you choose. SIZE & SHAPE - True Size: drag Greenland onto Africa and see how far the Mercator map misleads - Bigger Than You Think: Africa outsizes the USA, China, India and Europe (without Russia) put together; your country next to others its size - How round is Earth, really — the spheroid and the relief, exaggerated or not - Shortest routes, the horizon from any height and how much the curve hides, moving tectonic plates and the Ring of Fire - Through the Earth: your antipode, and a straight tunnel from London to Sydney through the planet's layers WATER - All of Earth's water gathered into one sphere — and the fresh water, and the lakes and rivers - Ice sheets as slabs over the land - Sea level: raise the ocean and watch real coastlines flood — or lower it to the last ice age, when Britain was joined to Europe - How many days all the world's rivers would take to fill Lake Baikal - Fourteen lakes, each with a ball of its true volume — and the world's rivers and yearly rainfall on the globe PEOPLE - Population as columns on the globe - Half of humanity lives inside a surprisingly small circle - If everyone lived like Manhattan, Paris or Houston - Earth at night: city lights from space - Your share of the planet: your square of land and cube of water, at true size in AR TIME & SEASONS - Live Earth with the real day/night line and the Moon's phase - Why seasons happen: the orbit, the tilt, and the same sunlight spread over more ground - Day length at every latitude, and why noon isn't at 12:00 - Time zones and how far they are from the Sun Every figure is traceable: tap ⓘ in any scene for its sources (NASA, NOAA, USGS, UN, Natural Earth and others). Four scenes are free, one per chapter. A single one-time purchase opens the other eighteen and AR in every scene. No subscription, no ads, no account, no tracking — the only thing that goes online is the purchase. In 14 languages. Metric or imperial units. iPhone, iPhone Duo and iPad.