WP Moon Phase Widget plugin allows you to add an awesome moon phase widget to sidebar or post. Key features Auto Geo detection Moon phase name and image Moonset and moonrise time Moon zodiac sign Ability to change the background color Ability to add the widget to a sidebar or a post (via shortcode) You can learn more about moon phase here Usage In sidebar You can add a widget as a standard WordPress widget. Go to Appearance > Widgets Find WP Moon Phase Widget Add to a sidebar Add a title (optional) Configure desired background color (default is white) In a post or a page You can add the widget to post or page via shortcode: [mph-widget] With specified background color: [mph-widget color=”#ffffff”] You can use only one widget at a time. So if you want to add it to post, delete it from the sidebar. Credits Based on moon-phase-widget javascript library.