mClock is a fullscreen clock for the N800, including a day/night world map. Upon program load, the current season is calculated and the appropriate season background is loaded. You can also use D-Pad left/right to manually flip through the season backgrounds.
This is what the “small clock” mode looks like:

I’ve also added a power-waste mode to keep the device display turned on. D-Pad up activates this, and displays a red battery icon to warn you of the consequences… Unfortunately, this function might or might not work on your device: I had BIG problems with the osso.context and the D-BUS, and it doesn’t work on my device right now – however, it SHOULD :-) Glad from any feedback/fix from a more advanced developer!

Current status: Stable, version 0.4.0

Download: mClock.garage.maemo.org

Credits:

• Programmed in Python/PyMaemo.
• Package made with PyPackager and PyGTKEditor by khertan.net (Thanks again).
• Earth images: NASA Earth Observatory / Blue Marble: Next Generation
• Day/night terminator calculation derived from Java code by J. Giesen/GeoAstro
• Uses sun.py:
• (c) Paul Schlyter, 1989, 1992. Released to the public domain by Paul Schlyter, December 1992
• Direct conversion to Java: Sean Russell
• Conversion to Python Class, 2002-03-21 Henrik Härkönen
• Solar Altitude added by Miguel Tremblay 2005-01-16

History:

0.3.0

• fix bug of app not being displayed in task navigator
• correctly display sun in eastern hemisphere
• includes a large icon for finger-based navigation in TN
• includes a package-icon

0.4.0

• fix display problem with dates when displayed date includes unicode char (e.g. spanish “sab”)
• optimize Hildon .desktop file to also include a comment (used by the desktop when working in Finger mode)
• take advantage of the new feature in pypackager 0.5 to have a multiline package description
  -improved sun icon (instead of two circles drawn)

Roadmap:0.5.0: optimize behaviour when app not in foreground (stop screen updates to save power)

1.0.0

• make app GTK-based to resolve naming issues in taks navigator
• enable/disable sun display and persist this setting
• save settings in INI instead of gconf for speeds sake
• change poweron-mode to just keep display alight for 60 seconds once
• fix accents bug

1.5.0: add GMT display, add Swatch @beat time display

2.0.0: include an invisible touch-enabled timezone map to quickly find the time at a certain location, perhaps also with a city map

3.0.0: include the original “M Clock” from Guido…

Additional screenshots: Big clock mode, live on the device.