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Your Age On Other Worlds

Want to melt those years away?

Travel to an outer planet!

Fill in your birthdate below in the space indicated. (Note you must enter the year as a 4-digit number!)

Click on the "Calculate" button.

Notice that your age on other worlds will automatically fill in. Notice that Your age is different on the different worlds. Notice that your age in "days" varies wildly.

Notice when your next birthday on each world will be. The date given is an "earth date".

ENTER YOUR BIRTHDATE HERE → MONTH DAY YEAR

MERCURY

Your age is

Mercurian days
Mercurian years

Next Birthday

VENUS

Your age is

Venusian days
Venusian years

Next Birthday

EARTH

Your age is

Earth days
Earth years

Next Birthday

MARS

Your age is

Martian days
Martian years

Next Birthday

JUPITER

Your age is

Jovian days
Jovian years

Next Birthday

SATURN

Your age is

Saturnian days
Saturnian years

Next Birthday

URANUS

Your age is

Uranian days
Uranian years

Next Birthday

NEPTUNE

Your age is

Neptunian days
Neptunian years

Next Birthday

PLUTO

Your age is

Plutonian days
Plutonian years

Next Birthday

WHAT IS GOING ON?

The Days (And Years) Of Our Lives

Looking at the numbers above, you'll immediately notice that you are different ages on the different planets. This brings up the question of how we define the time intervals we measure. What is a day? What is a year?

The earth is in motion. Actually, several different motions all at once. There are two that specifically interest us. First, the earth rotates on its axis, like a spinning top. Second, the earth revolves around the sun, like a tetherball at the end of a string going around the center pole.
The top-like rotation of the earth on its axis is how we define the day. The time it takes the earth to rotate from noon until the next noon we define as one day. We further divide this period of time into 24 hours, each of which is divided into 60 minutes, each of which is broken into 60 seconds. There are no rules that govern the rotation rates of the planets, it all depends on how much "spin" was in the original material that went into forming each one. Giant Jupiter has lots of spin, turning once on its axis every 10 hours, while Venus takes 243 days to spin once.
The revolution of the earth around the sun is how we define the year. A year is the time it takes the earth to make one revolution - a little over 365 days.
We all learn in grade school that the planets move at differing rates around the sun. While earth takes 365 days to make one circuit, the closest planet, Mercury, takes only 88 days. Poor, ponderous, and distant Pluto takes a whopping 248 years for one revolution. Below is a table with the rotation rates and revolution rates of all the planets.

Planet	Rotation Period	Revolution Period
Mercury	58.6 days	87.97 days
Venus	243 days	224.7 days
Earth	0.99 days	365.26 days
Mars	1.03 days	1.88 years
Jupiter	0.41 days	11.86 years
Saturn	0.45 days	29.46 years
Uranus	0.72 days	84.01 years
Neptune	0.67 days	164.79 years
Pluto	6.39 days	248.59 years

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