A clock with a twist: the face is partitioned into day and night, showing at a glance how many hours of each are remaining. It also shows sunrise, sunset, twilight, moon visibility, and stars - all accurate for today at your current location. You can add the TerraTime Clock to your device's home screen as a widget, giving you at-a-glance access to its features - as well as the current time, of course.
The basic TerraTime Clock is an ordinary analog clock face, colored partially black (with stars) for night and partially sky blue for day. These show the hours of daylight and darkness each day, read from the clock's numbers, as the hour hand (the short yellow one) moves between them. Twilight appears as the gradient between the colors, while the rising and setting sun is shown at the correct time on the edge of the face.
Partway between the center and the edge of the clock face is the current moon phase. Its position on the clock face shows the time of "lunar noon", when the moon is at its apex; if lunar noon doesn't occur on the current clock face, the icon will simply appear at the midnight location. When applicable, the crescent moon is also shown at the correct angle for lunar noon at your latitude. The pale line behind the moon icon shows the time period when the moon is visible in the sky; this line intersects the clock rim at moonrise and moonset.
The stars on the night side of the clock are a miniature snapshot of the heavens for your hemisphere (northern or southern), though admittedly they're too small to show much detail. They are accurately positioned for your longitude and season, however.
The clock activity shown above also displays specific data for sunrise, sunset, and length of day and night, as well as moon phase, rise, and set. Tapping any of the moon data fields will open my Moon Phase app, if installed.
The clock has options for a 24-hour mode which shows the entire day/night cycle for the current day, and which (in my opinion) is more pleasing than the default 12-hour clock. However, it does take a bit of mental adjustment when reading the time; the angle of the hour hand won't generally be what you expect for a given hour. Instead, you need to look at what numbers the hour hand is pointing near, and read the hour from there. Alternatively, you have the option of taking the numbers off completely, if you prefer a clean look.
The image to the right shows an example of the TerraTime Clock widget, enabling you to add the clock directly to your Android home screen. It's available in three sizes and is included with the app; to install, simply long-press on a vacant area of your home screen and select Widgets, then the size of TerraTime Clock you'd like.
Note: the TerraTime Clock started life as the DaylightClock gadget for iGoogle, which is also still available.