blankblank blank

Archive for the 'time' Category

Day/Night World Map

Application Name: Daylight World Map

Description: Shows day/night regions in world map.

Publisher’s website: SPWebGames

Cost: Free (ad-supported

Version/date reviewed: v.2.31  /  6-15-11

Phone/OS: Droid X / Android 2.2

Android Market (mobile app only)
Android Market (browser)

Daylight World Map is the Android version of the classic Geochron wall clock that shows day/night conditions on a scrolling world map, but without the multi-thousand-dollar price tag.


Shaded areas indicate night (sun below horizon, while light areas indicate daylight; the yellow dot is the current location where the sun is directly overhead. Red dots are cities (which can be turned on/off), and the crosshairs show the current selected location.

The control icons on the left/right are a bit cryptic. On the left, top to bottom, they are:

  • Full-screen – Shows the map view full screen, without control icons or the ad.
  • Zoom in
  • Zoom out
  • Info – Toggles an info box for the currently selected location:


  • Settings – Lets you select the map background, turn cities on/off, and turn the info box on/off:


  • Exit – Exits the program.

The right controls:

  • Set location – Select this, and then choose either your phone location (at the top of the list), or the desired country:


  • After selecting a country, you’re given an additional control to select the city:


  • Date control – Lets you change the date for which the sunlight map is displayed (from the default, which is the current date).
  • Time control – Lets you change the time for the sunlight map (default is now). It’s in UTC (Greenwich time), so you’ll need to know the offset in hours between your current time zone and Greenwich time.
  • Time controls – The right/left arrow controls let you speed up/slow down/reverse time, and watch an animated view how the daylight zone changes. Tap on either of these buttons, and a “stop” button shows up below them to stop the animation. Tap on the “stop” button, and it changes to an “RT” button, “real-time”, that brings the display back to the current day and time.


As a bonus, it installs an Android widget that displays a mini-map on any Android screen that has enough free space. Long-tap on the widget, and it starts up the full app.

Other issues: Crashed once on me, but otherwise worked fine.

Final thoughts: A nice implementation of a day/night world map. I wish the icons were a bit more intuitive, and easier to view onscreen. But once you learn how they work, it’s not too tough to remember what functions they represent.

Android Live Wallpaper Of The Earth

Application Name: Earth Live Wallpaper

Description: Animated live wallpaper of Earth and other astronomical bodies, real and imagined.

Publisher’s website: Earth Live Wallpaper

Cost: Free version 1 (donationware); newer version 2 offers faster performance for about $2.75.

Version/date reviewed: v.1.3.9  /  10-31-10

Phone/OS: Droid X / Android 2.2


Android Market link (mobile app only) – main app
Android Market link (browser)


Android Market link (mobile app only) – map data
Android Market link (browser)

Note: You should download the app first, then the data. Some Android phones may not support live wallpaper.

Earth Live Wallpaper lets you show an animated image of the Earth as a background in your Android home screens. It also offers options to display other solar system objects like the sun, planets, moons, etc., as well as fictional/imaginary astronomical objects (e.g. planets from the Star Wars universe, Star Trek, Futurama, Avatar, etc.). You also have a huge number of options you can set:

  • Show the moon rotating around the Earth
  • Choose from a variety of background images, and how they’re animated
  • Add an animated starfield
  • Have the globe spin on its axis, rotate freely; interact with you as you swipe
  • And more …

Access the app from the Settings => Wallpaper => Live Wallpaper list, where it’s shown as EarthRot. For real geography, your map choices are:

Realtime Earth + Clouds => Shows the Earth with actual cloud patterns (updated every 3 hours), and day/night shading with city lights
Static Earth => Globe image fully lit with an arbitrary cloud pattern
Earth => Fully lit globe with no clouds
Earth city lights => Globe at night, with artificial lights from human activity.

I prefer the realtime earth, since it shows up-to-date data like the cloud patterns and night/day terminator line. But it will use about 70 kB of data every time it refreshes the cloud data, which changes every 3 hours or so; that’s close to 17 MB of data in a month, which might be an issue if you’re on a limited data plan.

Issues: None. My phone supports live wallpaper; if yours doesn’t, this wallpaper won’t be terribly useful. Live wallpapers also consume a little bit of extra battery power, so if battery life is a critical issue, you might want to think twice.

Final thoughts: Looks cool, and the realtime Earth view offers useful information. Not an essential app, but if you can live with the slight power drain, worth having.