Calculates your age on all 9 planets (Mercury through Neptune) plus the Moon and Pluto. Input: date of birth (for exact calculation) or age in Earth years. Optional weight input (kg or lb). Outputs for each body: age in planetary years, number of birthdays celebrated, countdown to next birthday (in Earth days/months/years), weight under that planet's gravity, and total sunrises witnessed (toggle). Planet data: orbital periods from NASA Planetary Fact Sheet; surface gravity ratios; sidereal rotation periods. Includes fun fact per planet. Earth summary shows total Earth years, days lived, and hours lived.
