Time - The four hands on the clock face show time down to the tenth of a second.
Unix Time - The window at the bottom of the clock shows the unix time used by computers (seconds since 1/1/1970)
Daylight Savings Time - The circular window in the upper left of the middle of the clock face shows if you are currently observing daylight savings time.
World Time - The outer ring on the clock face shows your current timezone and reading the hour number below any city shows you the time in that other timezone.
AM/PM Indicator - The circular window in the upper right of the middle of the clock face shows whether it is AM or PM.
Date Clock Face #2
Perpetual Calendar - This clock face shows the current month, day of the week, day of the month and year.
Leap Year Indicator - The small window above the year indicates the leap year cycle. If it displays a 0 then it is a leap year. Other numbers indicate the position in the 4 year cycle.
Day of the Year / Days Left - The window in the center left shows how many days (including today) have passed already. The window in the center right shows the number of days left in the year.
Zodiak Sign - The outer ring shows the zodiak sign that the sun is current within. The red line indicates today's date.
Season - The inner ring shows the current season in the northern hemisphere. Support for the southern hemisphere will come in an future update. Sorry Australia!
Equinox / Solstice - The dates of the two solstices and equinoxes are indicated on the inner ring.
Sun Clock Face #3
Sunrise / Sunset - The bottom two lines, separating the light blue from the medium blue regions show the times of sunrise and sunset. These are the times when the sun just disappears or appears on the horizon.
Dawn / Dusk - The upper two lines, separating the medium blue from the dark blue regions show the times of dawn and dusk. These are the times when the sun's light is still visible even though the sun isn't.
Solar Noon - Solar noon is the time when the sun is directly overhead and differs from actual noon because of the tilt of the earth, daylight savings time and other factors. The position of the sun icon and time display show the time of solar noon.
Length of Day/Night - The time between dusk and dawn is night. The length of night is displayed near the top of this clock face. The time between sunrise and sunset is day. The length of the day is displayed near the bottom of the clock face.
Day / Night Indicator - The red arm indicates the portion of the day that you are in, as indicated by the colored regions: Dawn, Day, Dusk, Night.
24 hour time - The red arm indicates the current 24 hour time.
Moon Clock Face #4
Moon Phases - A visual representation of the moon shows how it looks in the sky right now.
Moon Rise / Set - The times at which the moon rises and sets is displayed in two windows at the top of this clock face. The rise time is on the left and the set time is on the right.
Moon Fraction Illuminated - The window at the top center shows the current fraction of the moon that is illuminated.
Moon Magnitude - The window at the bottom left shows the current magnitude (brightness) of the moon.
Moon Description - The window at the bottom center shows the name of the current moon phase. Waxing means that the moon is growing towards a full moon. Waning means that the moon is shrinking towards a new moon.
Moon Constellation - The window at the bottom right shows the constellation that the moon is current inside of, in the night sky.
Moon Size - Because the moons orbit around Earth is not perfectly circular, it gets closer and further away and appears slightly bigger and smaller at different times. The dotted ring around the image of the moon shows it's maximum possible size with the current relative size currently displayed.
Moon Age - The moon cycle is 29.5 days. The current age of the moon, in days, is displayed at the top of the clock face.
Next Lunar Eclipse - The date of the next lunar eclipse is displayed along with a description of the eclipse.
Orrery Clock Face #5
Orrery - The orrery shows an accurate picture of the solar system with the positions of the planets.
Planet Distance from Earth - Select a planet to display its distance from the earth in astronomical units (1AU = Earth's Distance from the sun = 150 million km.
Planet Magnitude - Select a planet to display its current magnitude (brightness) in the night sky.
Planet Apparent Size - Select a planet to display its current apparent size (in arc seconds) in the night sky.
Planets Clock Face #6
Planet Rise / Set - This clock face shows the rise and set times for each planet so you can see when certain planets will be visible in the night sky. The red line indicates the current time.
Sky Chart Planetarium Clock Face #7
Celestial Body Positions - The positions of the planets, sun and moon will be displayed in their correct position in the sky. Imagine yourself holding the clock face above your head with North facing North and the picture should represent the sky you can see.
Constellations - The major constellations that are currently visible.
Milkyway - An outline of the milkway that you could see if you were viewing the night sky from a dark location.
Celestial Equator - The celestial equator is shown as a light blue line.
Zenith and 45° Circle - For convenience, a green dot and circle representing an angle of 45° above the horizon are display.
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Special thanks to Astronomy Engine which made some of the calculations easier.