SPACE • TIME • YOU
Where in the Universe are you just being born?
Somewhere in the cosmos, your story is only just beginning. Discover which stars are now receiving light that left Earth when you were born — a journey of light, not a view of you as a baby.
Find my stars ↓Your birthday is still travelling
Light does not arrive everywhere at once. It takes about eight minutes to reach us from the Sun, and years to cross the distances between stars. A light-year is a distance: the distance light travels in one year.
Imagine the light leaving Earth on the day you were born. After twenty years, its outward-moving front has a radius of about twenty light-years. After fifty years, fifty light-years. Your birthday does not belong to one particular star: it sweeps through a whole neighbourhood of stars.
YOUR PERSONAL LIGHT FRONT
Where has your light reached?
Your date stays in this page: it is not sent to a server or saved. Example shown initially: 30 years ago. Start with ±1 light-year. Try ±0.5 for a tighter selection, or ±2 / ±5 if there are too few matches. This is a time window around arrival, not a distance uncertainty.
Loading the star catalogue…
● Already passed● In the shell● Not reached yet
3D: the wireframe shows the light front; projection can overlap stars at different depths. Sky map: equatorial coordinates, north up; not a local horizon view. Click a star or select it below.
Stars near your light front
What would someone there see?
Take Sirius, about 8.6 light-years away. Light from Earth arriving there today left us about 8.6 years ago. If you are five, your birthday light has roughly 3.6 years left to travel. If you are ten, it passed Sirius about 1.4 years ago. Try those ages with the slider and watch the light front cross this familiar star.
A beautiful idea, not a cosmic home movie
Receiving light from Earth is not the same as seeing a person. Individual photons disperse, and resolving a human across interstellar distances is far beyond our technology. The tool tracks a hypothetical light signal emitted from Earth, not an intact recording of your life. Nor does a star on the map imply an inhabited planet.
Why a shell rather than one exact star?
There may be no catalogued star at exactly your age in light-years. The chosen margin defines a neighbourhood around the light front; ±1 light-year corresponds to arrivals within roughly one year of the simulated date. This is an exploration window, not a measurement uncertainty. Distances themselves are estimates, so arrival dates are approximate.
Data and scientific limits
This tool includes 7,971 HYG v4.1 catalogue entries within 155 light-years, including separate components of multiple systems. It is not a complete census, especially for faint stars. The simulation spans 0–150 years and uses 365.25 days per year. It treats stars and the Sun as stationary, neglects Earth’s tiny orbital offset and uses J2000 coordinates. Stellar motions and distance uncertainties are not propagated; the display is educational, not precision timing. Magnitude ≤6 indicates potential naked-eye visibility under dark skies, not visibility from your location tonight.
Catalogue and adapted subset: HYG v4.1 — David Nash / Astronomy Nexus, CC BY-SA 4.0. JSON · HYG README.
The years pass here. Elsewhere, their light is only just arriving.
← Astronomy Lab
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