Greyhawk Calendar

A web-based tool for tracking time and dynamically generating celestial events, weather, and tides in the World of Greyhawk for Dungeons & Dragons campaigns.

✨ Features

• 🗓️ Fully Accurate Greyhawk Calendar
  Supports all 12 months, 4 festival weeks, and weekday tracking (Starday through Freeday).

• 🌙 Celestial Phases
  Accurately calculates and displays the phases of Luna and Celene with custom SVG icons.

• 🌤️ Dynamic Weather Simulation

  • Temperature calculated using seasonal sine-based variation.
  • Sky conditions and precipitation types based on classic Greyhawk tables.
  • Continuation rules prevent weather from changing too abruptly.

• 🌅 Sunrise and Sunset Times
  Calculated based on latitude using Earth-like approximations.

• 🌊 Tide Generator
  Combines lunar and solar gravitational effects for high/low tide simulation, including tide strength and timing.

• 🌬️ Wind Conditions
  Wind speed and a hover-enabled tooltip for interpreting in-game effects (based on AD&D high wind tables).

• 🧭 Latitude Control
  Adjustable slider to simulate different regions or elevations — affects sunrise/sunset and base temperature.

• 💾 Save/Load State
  Easily save and resume your campaign’s calendar and weather with a single click.

🔧 How to Use

1. Clone the repo:

   git clone https://github.com/gumyr/GreyhawkCalendar.git
   

2. Open calendar.html with your browser.