Moontiles Pebble Watchface
Key information is found in 6 titles as follows:
Time (Hour:Minute), Day of the Week, Moon Phase, Day of the Month, Month, Year
For the moon phase, an icon for one of 14 phases of the moon is displayed with a different representation for waxing and waning moons. I wanted to do the actual calculations on the Pebble to determine moon phase but without a floating point math library in the Pebble API, I chose to dynamically generate 5 years of data and store it in the app. If you change the date to one outside of the table range, the Moon Phase won't show any icon. So moon phases prior to the watchfile compile date will be blank.
I used two free fonts from DaFont.com:
WW Digital by Michelle Laura Moon Phases by Curtis Clark
My source code for pre-generating the moon phases table is based heavily on an old C-based GUI MoonTool for Sun workstations written by John Walker in 1987. John is crazy smart and I really don't understand all of the underlying seriously complex algorithms nor do I aspire to be a plantary scientist. The tile layout is based on Ronald van der Lingen's Retro Clock watchface with different type treatment, a more readable font, no lines through the font, and no odd white space between tiles.
The Watchface only imports the exact characters needed to render the display. It also only updates the portion of the display that has changed. However, I'm not sure if this saves much battery power.