Star Chart

☀☀☀☀ Star Chart is just plain fun. Using the compass on your phone, this app helps find constellations and individual stars based on your location. This well-reviewed, popular, free app boasts more than 20 million users worldwide. In-app purchases of varying prices (some as high as $39.99) are required for in-depth information not necessary for casual users.  Tech and science journalists could consult Star Chart for a quick reality-check. This app is available to Apple and Android users. One of the coolest apps I’ve used. — Olivia Davila

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