Well, nothing except knowing which stars and constellations you’re seeing.
Easily change your location to anywhere in the world.
View sunrise, sunset, moonrise, and moonset times.

Place.to /Getty Images
Can be a little cluttered.
This app delivers a visual display of the sky.
Also has apps available for WatchOS and macOS.
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Allows you to drill down and learn more about a star, planet, or other finding.
No Android app available.
Not a free app.

AR blending is very touchy to movement.
you could also use the app on your iPhone, Apple Watch, and macOS.
View the sky with or without the AR overlay.

Dates can be set to any time including present and past.
Works during the day or night.
Some features hidden behind paywall.

you might also snap and share pictures from right within the app.
Detailed lists and explanations of what you’ve got the option to expect to see.
Ability to zoom in close to planet or star surface for additional detail.

Not free for iOS users.
If you love the details, then SkySafari is worth the money you’ll pay for it.
Best for Choosing How You Want to View: Star Walk 2
Offers detailed views and information.

Nice illustrations when AR camera not in use.
Planetary timing and information available.
AR Camera can be glitchy.
Ads can be invasive.
There’s more to the sky than stars, and Star Walk 2 Free will help you find it.
Fortunately, they aren’t completely overwhelming.
Best for Learning About Astral Bodies: Astronomy Now Magazine
Easy to use interface.
Individual edition prices are a little high.
The Astronomy Now Magazine is UK-based but contains loads of information for anyone curious.
And the app is a pleasure to look at on iOS devices.