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Add a Moon phase indicator to the Status Bar with this tweak
One of the features that comes standard on the Apple Watch that doesn't come on the iPhone is Moon phase tracking. This lets you keep track of the Moon, whether it's getting a full or new Moon, or anything in between.
If you've always wished your iPhone could do this too, you can use a new jailbreak tweak called MoonPhase by rainwolf. This will add a new icon to the right of the time in the Status Bar that reflects upon the current Moon phase.
The icon is refreshed every time the clock changes, which on a stock device, is once every minute. The icon can be seen anywhere the time appears in the Status Bar, which includes inside apps and on the Home screen. Unfortunately, it doesn't appear on the Lock screen
The MoonPhase icon uses both black and white for its base colors out of the box, which makes it easy to distinguish against essentially any UI color. Because of the icon's contrasting colors, and the small hairline border it has, it's rare that you're ever going to have trouble seeing it; even when the app's UI is white.
You can configure a couple of options in the MoonPhase preferences pane, which you'll find in the Settings app following installation: