As a Premium subscriber, you can see the lunar phase for each day displayed in the Luna row right above your chart. See the image below for an example of what this will look like when it's enabled.
iPhone
- Tap More.
- Select Settings.
- Tap Lunar Phase.
- Tap Yes to enable, or No to disable.
Android
- Tap the Menu icon (three horizontal lines) in the upper left corner.
- Select Settings.
- Tap the Lunar Phase checkbox to enable (checked) or disable (unchecked).