Calendar
One date, shown in many calendar systems over a model of the Solar System.
One sky with many ways to count. A live model of our Solar System, and its relationship with our many date systems.
AstronomyTimeTech demoAbout Calendar
Calendar shows a model of the Solar System with the Earth, the Moon and the planets where they are on a chosen date. You can drag the timeline back and forth over thousands of years.
Alongside it, the same date is shown in a number of calendar systems, from the Gregorian and Julian to the Hebrew, Chinese and French Republican calendars, so you can compare how each one counts the same day.
A Live Solar System
The Earth, the Moon and the planets positioned for the chosen date.
Many Calendars
The same date in the Gregorian, Julian, Hebrew, Chinese, French Republican and other systems.
Thousands of Years
Drag the timeline from the year 5000 back to the year negative 1000.