The real app, in your browser.

This isn't a mockup. It's the same logic and the same bundled NASA/JPL event table the iPhone app ships with — running right here, with nothing sent to any server.

• Today shows the live Mercury status and countdown.
• Calendar marks retrograde and shadow days — browse any month.
• Timeline lists the next windows at a glance.
• Alerts shows the notification cadences you can choose.