SkySafari Legacy is a discontinued mobile astronomy application for Android devices. It was a popular and highly-rated app before its successor, SkySafari, was released and updated significantly. While you can no longer download it from app stores, some users may still have it installed on older devices.

Essentially, it provided a virtual planetarium in your pocket, allowing users to :

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View a realistic simulation of the night sky:

Showing stars, planets, constellations, and deep-sky objects based on your location and time.
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Identify celestial objects:

Point your device at the sky, and the app would tell you what you[SQ]re looking at.
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Plan observing sessions:

See what objects will be visible at a particular time and location.
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Access astronomical data:

Get information on celestial objects, including their positions, magnitudes, and other properties.

Think of it as an older, less feature-rich version of the current SkySafari apps. Many of its functionalities are now incorporated into and expanded upon in the current SkySafari 7 Pro or SkySafari 6 Pro.