Vipassana Moon — GodOfAstro

• The arc
  Ten moons in a half-ring — day 1 to day 10, each in its true phase.
• Day cards
  Mark each day sat — the card counts them, the moon keeps you honest.
• The moon crossing
  The retreat is a lunation in miniature — the moon moves while you sit.
• Metta
  Each kept day is a soft mark — the count grows by sitting.

Web app above is the full experience. Native builds below.