Planet Calendar is a free Android application developed by Cobworks that offers an educational and interactive way to explore the solar system. The program displays the position of the Earth in its orbit around the Sun, indicating one complete orbit or one Earth year. Not only this, but it also allows you to track the positions of other planets and learn about their orbits.

With Planet Calendar, you can accurately see where the planets are located right now or speed up the solar system to see where they will be in the future. You can even go back in time and see how the planets were aligned on specific dates, such as your birthday. The application also lets you cycle through the planets to get their current year and see the solar system from different perspectives.

Overall, Planet Calendar is an excellent educational and reference tool for anyone interested in learning more about the solar system. It is easy to use and provides accurate information about the planets' positions and orbits.