What the solar system looked like on your birthday
Example · Jan 1, 2000
Jupiter and Saturn lined upDirections as seen from the Sun. Ring spacing is order, angles are real.
Example · Jan 1, 2000
Jupiter and Saturn lined upDirections as seen from the Sun. Ring spacing is order, angles are real.
The numbers (table)
| Planet | Birthday | Today | Laps |
|---|---|---|---|
| Mercury | 253.8° | 97.1° | 111.5 |
| Venus | 182.6° | 63.0° | 43.6 |
| Earth | 100.4° | 50.7° | 26.8 |
| Mars | 359.4° | 106.3° | 14.2 |
| Jupiter | 36.3° | 134.6° | 2.2 |
| Saturn | 45.7° | 12.3° | 0.9 |
| Uranus | 316.4° | 63.2° | 0.2 |
| Neptune | 303.9° | 2.9° | 0.1 |
Age 26 · Mercury lapped you 85 times · Story: Jupiter and Saturn lined up (9.4°)
How it is computed (R0–R8)
Pick one date and this free tool draws where the eight planets, Mercury to Neptune, really stood around the Sun that day, then counts the laps each has run since.
What the board shows
The Sun seen from above. The lamp in the middle is the Sun; the eight rings, from the inside, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Ring spacing shows order, not distance; only the direction of each token is real.
How it is computed
Each date is taken at 12:00 UTC (R0). astronomy-engine 2.1.19 gives each planet's direction from the Sun (J2000 ecliptic longitude, R1). 0° points to the vernal equinox, to the right of the board, growing counter-clockwise; shown to one decimal.
Distance travelled since your birthday is today's angle minus the birthday angle, plus whole laps estimated from NASA's orbital periods (R2). Laps are rounded down to one decimal, so an unfinished lap never counts (R3). Mercury lapping you counts the times the Mercury–Earth angle passed zero (R4).
The one-line story (R5): first, a planet within 6° of Earth's direction (Mercury or Venus: between the Sun and Earth) or of the opposite direction (behind the Sun); otherwise the closest pair of planets within 15°; otherwise the planet nearest the far side of the Sun. These thresholds are ours.
Age is full years on today's date (R6); Feb 29 birthdays add a year on Mar 1 in common years. When Earth's whole laps equal your age the tally says “= your age”, a day or two around your birthday it can be one short and says “≈” (R7). In Today view each token glides forward along its ring; planets that have not finished one lap shade the part they covered (R8).
Checked against JPL Horizons
NASA JPL Horizons positions for 3 dates (1978-07-25, 1984-01-10, 2000-01-01) × 8 planets: largest difference 0.0044° (Mercury, 1984). The lap counts match day-by-day tracking for all 128 test pairs.
Art
Illustration: AI-generated (Gemini), edited by plusbeauxjours. Rings, tokens, words and lines are drawn by code from the computed values.
Sources · checked 2026-11-13
- Don Cross · astronomy-engine 2.1.19 (MIT) checked 2026-11-13
The engine that computes every position. VSOP87-based, accurate to ±1 arcminute. - NASA JPL · Horizons API checked 2026-11-13
Used to check the engine: 3 dates × 8 planets, largest difference 0.0044°. - NASA NSSDC · Planetary Fact Sheet checked 2026-11-13
Orbital periods (Mercury 88.0 days … Neptune 59,800 days) and distances. Used only to count whole laps. - NASA JPL · Approximate Positions of the Planets checked 2026-11-13
The simple orbital elements are valid only for 1800–2050, so this tool does not use them.
Good to know
Positions drawn from astronomical calculation (astronomy-engine, checked against NASA JPL Horizons). Ring spacing shows order, not real distance. This is not astrology and carries no meaning or advice.
The date you pick is used only inside this browser. Nothing is stored; analytics only gets the decade. A link you share carries the date, nothing else.
Questions
Are these the real positions that day?
Yes. They come from astronomy-engine and were checked against NASA JPL Horizons for 3 dates × 8 planets. The largest difference is 0.0044°, far too small to see on the board.
Why are the rings evenly spaced?
Real distances run from 57.9 million km (Mercury) to 4,515 million km (Neptune). Drawn to scale, the four inner planets would vanish next to the lamp. So the rings show order, evenly spaced, and only the directions are real.
Why don't you ask for my birth time?
Each date is computed at 12:00 UTC. Within one day Mercury moves at most about 2° and the others less than 1°, so the board looks the same.
Is this astrology?
No. It is an astronomy picture of where each planet was around the Sun. No signs, no houses, no meanings.
Why is Earth's lap count my age?
One lap of Earth around the Sun is one year, so the laps since you were born are your age. A lap takes 365.256 days, so a day or two around your birthday the count can be one short; then we show ≈.
Why has Neptune barely moved?
Neptune takes 59,800 days, about 164 years, for one lap. At forty you have seen about a quarter of it; the Today view shades the part of its ring it has covered.
What did the sky look like from where I was?
This board is the view from above the Sun. For the sky you would have seen from a place that night, try The Sky That Night.
For the sky from where you were, see The Sky That Night; for NASA's photo from that day, Birthday Space.
Last updated 2026-11-13 · astronomy-engine 2.1.19 · checked against: NASA JPL Horizons