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World Time Labv2026.7.5
  • Explore time around EarthWorld Clock

    See the live globe, local clocks, and places around the world.

    • Live World ClockExplore day, night, time zones, and pinned places.
    • Time by CitySearch current local time in cities worldwide.
    • Time by CountrySee every civil time zone used by a country.
    • Distance Between CitiesMeasure great-circle distance on a real globe.
    • Day & Night WidgetAdd the live day and night map to another site.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Convert and coordinateTime Zones

    Translate city times, UTC offsets, and abbreviations without guesswork.

    • Time Zone ConverterCompare cities, PST, WAT, UTC offsets, and more in one view.
    • Meeting Time FinderFind working-hour overlap across as many as six locations.
    • Time Zone Conversion ChartsBrowse quick reference tables for common zone pairs.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Follow the skySun & Moon

    Track sunlight, moon phases, eclipses, and the changing seasons.

    • Sunrise & SunsetFind solar times and day length for any listed city.
    • Moon PhasesSee the live Moon, moonrise, moonset, and phase calendar.
    • Solar & Lunar EclipsesExplore upcoming eclipses and local visibility.
    • Equinoxes & SolsticesUnderstand the tilt, sunlight, and season changes.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Plan dates your wayCalendars & Dates

    Build calendars, count days, and answer practical date questions.

    • 2026 CalendarBrowse the full year with week numbers and holidays.
    • Printable Calendar MakerCustomize columns, colors, logos, holidays, PDF, and ICS.
    • Date CalculatorsAdd dates, count days, find weekdays, and check weeks.
    • Days Between DatesCalculate an exact calendar difference.
    • Add or Subtract a DateMove forward or backward by a duration.
    • Days UntilCreate or browse live event countdowns.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Measure every momentTimers

    Count down, measure laps, or test your reaction speed.

    • Online TimerCount down or up with speed, precision, and optional sound.
    • StopwatchMeasure elapsed time and visual lap splits.
    • Reaction Time TestMeasure keyboard or tap response in milliseconds.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Experiment with a worldPlanet Lab

    Change a planet, inspect the physics, and explore what-if scenarios.

    • Planet SimulatorBuild a world and see computed physical changes.
    • All What-If ScenariosBrowse climate, orbit, impact, and ocean experiments.
    • Snowball EarthFollow ice-albedo feedback across Earth.
    • Runaway GreenhouseExplore an illustrated Venus-like end state.
    • Asteroid ImpactReplay a staged impact, shock ring, and crater.
    • Mega-TsunamiWatch teaching wavefronts cross an ocean.
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Explore World Time Lab

Tools & guides

    • Live World Clock
    • Time by City
    • Time by Country
    • Distance Between Cities
    • Day & Night Widget
    • Time Zone Converter
    • Meeting Time Finder
    • Time Zone Conversion Charts
    • Sunrise & Sunset
    • Moon Phases
    • Solar & Lunar Eclipses
    • Equinoxes & Solstices
    • 2026 Calendar
    • Printable Calendar Maker
    • Date Calculators
    • Days Between Dates
    • Add or Subtract a Date
    • Days Until
    • Online Timer
    • Stopwatch
    • Reaction Time Test
    • Planet Simulator
    • All What-If Scenarios
    • Snowball Earth
    • Runaway Greenhouse
    • Asteroid Impact
    • Mega-Tsunami
About & data
About World Time LabMethodology & Data SourcesReport an ErrorContact
In this sectionPlanet Lab
Lab
  • Planet Simulator
Climate & habitability
  • Snowball Earth
  • Runaway Greenhouse
  • Melt the Ice Caps
  • Tidally Locked Planet
Spin, orbit & sky
  • Earth Stops Spinning
  • Fast-Spinning Earth
  • Earth With Uranus's Tilt
  • Earth Loses the Moon
  • Red Giant Sun
Build a world
  • Super-Earth
  • Planet With Rings
Impacts & oceans
  • Asteroid Impact
  • Mega-Tsunami
Home/Planet Lab/Asteroid impact

โ˜„๏ธ Asteroid impact

Stage an inbound object, contact flash, shock ring, and crater at Chicxulub.

The staged impact is illustrated; its energy and climate aftermath are not computed.

Building the laboratory: star, orbit, planet, atmosphere...

What actually happens

The Chicxulub impactor was roughly 10 kilometers across and triggered effects from the impact site to the global climate. Its consequences depended on impact energy, angle, target rock, ejecta, aerosols, and the atmosphere.

This lab effect aims at the Chicxulub location, draws an inbound streak and contact flash, expands a great-circle shock ring, then leaves a crater marker. The staged graphics use a wall-clock teaching sequence independent of the Time speed and Play/Pause controls. The scenario does not contain impactor size, speed, angle, material, or an energy calculation.

There is no impact-winter calculation. Dust does not reduce the model's incoming sunlight, and the temperature and greenhouse controls remain at their Earth values unless the visitor changes them separately.

Cause and effect

How the simulation unfolds

Each step is labeled so you can tell a calculated result from an explanatory visual or wider scientific context.

  1. 1
    Changed input

    Start from Earth at Chicxulub

    The visual effect uses an Earth baseline and the Chicxulub location as its preset origin.

  2. 2
    Computed

    Earth's climate stays unchanged

    The ordinary Earth outputs remain available because no impact-energy or aerosol input enters the physics model.

  3. 3
    Illustrated

    Arrival, contact, shock, and crater appear

    An inbound streak, flash, great-circle ring, and persistent crater run on a readable wall-clock sequence independent of the teaching clock's speed and pause controls.

  4. 4
    Scientific context

    Real impacts couple many systems

    Shock, ejecta, fire, aerosols, and climate response require energy, geology, and atmospheric models.

Model transparency

What is computed, illustrated, and not modeled

Computed

Calculated by the lab

  • Unchanged Earth baseline quantities
Illustrated

Shown to explain the result

  • Inbound object and impact flash
  • Expanding great-circle shock ring
  • Crater marker until reset
Not modeled

Outside this model

  • Impactor trajectory and energy
  • Ejecta, fire, and damage
  • Dust loading and impact winter

Model scope: The effect is not an impact calculator. Its wall-clock timing is explanatory, not physical impact time, and it does not derive crater size, shock speed, damage, or temperature change.

More experiments

  • ๐Ÿฅถ Snowball Earth
  • ๐Ÿ”ฅ Runaway greenhouse
  • ๐Ÿ›‘ Stop the spin
  • ๐ŸŒ‘ Steal the Moon
  • ๐Ÿ™ƒ Tip it on its side
  • โ˜€๏ธ Age the Sun
  • ๐Ÿ’ช Super-Earth
  • ๐Ÿ‘๏ธ Eyeball world
  • Open the Planet Lab
World clock globeTime zone converterMeeting Time FinderTime by countryTime by cityConverter pagesSunrise and sunsetMoon phasesEclipsesSeasonsPlanet LabCalendarPrintable calendar makerDate calculatorsCountdownsTimerStopwatchReaction timeDistanceEmbeddable widget
AboutMethodology & data sourcesReport an errorContactPrivacyCookiesTerms

World Time Lab shows live day and night across the planet. Sun positions are computed with standard NOAA solar equations, and local times come from your browser's own IANA time zone database, so every calculation on this site runs on your device. This build loads no advertising, no analytics, and no third-party scripts at all, and asks for no account. It never asks where you are unless you press "Use my location" on an eclipse page, and that reading stays in your browser. The privacy page explains what that does and does not cover.

ยฉ 2026 World Time Lab ยท v2026.7.5ยท this build shipped July 24, 2026. Times are shown to the minute and can differ by a minute or two from horizon observations. Time zone boundaries derived from the timezone-boundary-builder project (ODbL); map shapes from Natural Earth; named administrative boundaries from geoBoundaries gbOpen with source years and licenses varying by country. City search data ยฉ GeoNames under CC BY 4.0, transformed for prefix search and updated July 2026. Seasons view climate groups derived from the Kottek et al. Koeppen-Geiger world map (2006).