Astronomy Tools HD is a free iPhone application developed by Ian Annase. This utility and tools app falls under the category of Utilities & Tools. With Astronomy Tools HD, users can easily convert, calculate, and measure astronomical distances, all in real time.

This app provides users with the ability to convert between various units of measurement, including parsecs, light years, astronomical units, miles, and kilometers. As users edit the fields, the distances are instantly updated. Additionally, Astronomy Tools HD allows users to calculate the distance to an astronomical object using arc seconds, as well as determine the angle in arc seconds from the distance of an object.

The app also offers a convenient reset button for fast edits, making it easy to make adjustments on the go. Furthermore, Astronomy Tools HD includes a collection of 100 HD pictures of galaxies, complete with names and distances, allowing users to explore the wonders of the universe visually.

For those interested in learning more about how distances are calculated in astronomy, the app also features an information tab with graphics to provide a clear understanding.

Overall, Astronomy Tools HD is a comprehensive and user-friendly tool for anyone interested in astronomy, providing the necessary functions to convert and calculate astronomical distances with ease.